A strong candidate for a motorcycle is a universal converter whose inlet and outlet match the exhaust, but none of these listings confirms motorcycle fitment. UNITHUB UH-CC21001 leads this comparison because it specifies 2-inch connections, a 13-inch overall length, an oxygen sensor port, and a heat shield. The other options include 2.5-inch connections, a 3-inch universal design, and products with less complete sizing details.
That makes checking your bike’s exhaust dimensions and emissions requirements essential before buying. These products are listed as automotive converters, and their federal or EPA descriptions do not establish motorcycle approval or compatibility.
Use the rankings to narrow candidates by available specifications, not as a substitute for confirming fit with the manufacturer or a qualified exhaust professional.
UNITHUB 2-Inch Universal Converter leads because it is the only listing here that gives a 2-inch inlet and outlet, a 13-inch overall length, an oxygen sensor port, and a heat shield. Those details make it the clearest starting point when your motorcycle’s exhaust measurements match. However, the listing describes an automotive converter and does not confirm motorcycle fitment.
Verify physical clearance, emissions rules, and compatibility with the bike’s exhaust and sensor setup before purchasing.
Our Top Picks
Best OverallIts 2-inch inlet and outlet, 13-inch length, oxygen sensor port, and heat shield provide the most specific fit-check details in this set.
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Best 2.5-Inch OptionThe listing specifies 2.5-inch inlet and outlet connections, stainless steel construction, and a 5-year/50,000-mile warranty.
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Best Pre-OBDII OptionIt is identified as a universal, stainless-steel converter meeting federal EPA pre-OBDII requirements, though connection dimensions are not provided.
View on Amazon- Largest Connections AP Exhaust 608227
- Compact Construction MagnaFlow 53956
Compare the Listed Converter Options
| # | Product | Weight | Dimensions | Buy |
|---|---|---|---|---|
| 1 | 1. UNITHUB UH-CC21001Best Overall | 3.65 lb | — | View on Amazon |
| 2 | 2. MagnaFlow 94006Best 2.5-Inch Option | 4 lb | 18 x 7 x 4 in | View on Amazon |
| 3 | 3. MagnaFlow 94009Best Pre-OBDII Option | 5 lb | 17.75"L x 7"W x 4.5"H | View on Amazon |
| 4 |  4. AP Exhaust 608227Largest Connections | 7 lb | 19"L x 4.5"W x 4.5"H | View on Amazon |
| 5 |  5. MagnaFlow 53956Compact Construction | — | 14"L x 5"W x 5"H | View on Amazon |
| 6 |  6. Davico 19217Exact-Fit Vehicle Replacement | 14 lb | — | View on Amazon |
Detailed Reviews: Best Catalytic Converter For Motorcycle
#1 · Best Overall
1. UNITHUB UH-CC21001
- Weight: 3.65 lb
Best for: 2-Inch Dimension-Matched Replacements.
Why it ranks #1: Its 2-inch inlet and outlet, 13-inch length, oxygen sensor port, and heat shield provide the most specific fit-check details in this set.
A 2-inch inlet and outlet paired with a 13-inch overall length gives this UNITHUB converter a defined sizing target for a vehicle with matching dimensions. Its ceramic carrier and 409 stainless steel body provide the listed converter construction, while an oxygen-sensor port supports a setup that uses one.
The stated 2-inch inlet and outlet make dimension matching central to choosing this universal unit; the 13-inch overall length is another measurement to consider when assessing available space. A heat shield is included to protect the chassis from converter-generated heat, and the single oxygen-sensor port supports systems that use that connection. It is EPA compliant but not CARB compliant, so emissions requirements and exact application matter. The listing describes vehicle fitment, not motorcycle-specific compatibility.
- 2-inch inlet and outlet dimensions are specified
- 13-inch overall length is stated
- Aluminized heat shield helps protect the chassis from converter heat
- Includes one oxygen-sensor port
- The listing does not establish motorcycle-specific fitment.
Skip it if you need a converter explicitly identified for a motorcycle; this listing gives vehicle dimensions, not motorcycle fitment.
Consider it only if your motorcycle setup can accept the specified 2-inch connections and 13-inch length, and its emissions requirements align with EPA rather than CARB compliance. The listing does not verify motorcycle fitment.
Full product details
| Brand | UNITHUB |
|---|---|
| Item Weight | 3.65 pounds |
| Item model number | UH-CC21001 |
| Manufacturer | UNITHUB |
| Part Number | UH-CC21001 |
| Model | catalytic converter |
| Package Dimensions | 13.74 x 5 x 4.92 inches |
Listed on Amazon as: Universal Catalytic Converter 2 Inch 2" Inlet/Outlet Cat Converter with Heat Shield and Oxygen Sensor Port High Flow Front 13 Inch Stainless Steel Direct Replacement (EPA Compliant)
View on Amazon#2 · Best 2.5-Inch Option
2. MagnaFlow 94006
- Weight: 4 lb
- Dimensions: 18 x 7 x 4 in
Best for: 2.5-Inch Pre-OBDII Connections.
Why it ranks #2: The listing specifies 2.5-inch inlet and outlet connections, stainless steel construction, and a 5-year/50,000-mile warranty.
MagnaFlow’s 94006 specifies 2.5-inch inlet and outlet connections, giving buyers a concrete sizing reference for a compatible exhaust system. It is a universal, stainless-steel converter described for Federal EPA Pre-OBDII requirements, not a product listing that establishes motorcycle-specific fitment.
The 2.5-inch inlet and outlet sizes provide a practical starting point for checking connection compatibility, while the universal installation format allows placement in the required location and orientation. Stainless-steel construction and the stated thermal-efficiency design describe its material and operating characteristics. Its emissions claim covers Pre-OBDII Federal EPA requirements, with exclusions for California, Colorado, New York, and Maine. Professional installation is highly recommended; motorcycle fitment is not specified.
- 2.5-inch inlet and outlet connections
- Universal installation permits placement and orientation choices
- Stainless-steel construction
- Designed for Federal EPA Pre-OBDII emissions requirements
- Professional installation is highly recommended.
Skip it if you need a 2-inch connection size; UNITHUB’s converter specifies 2-inch inlet and outlet dimensions, but does not establish motorcycle fitment either.
This suits a buyer whose compatible setup needs 2.5-inch connections and meets the listed Pre-OBDII emissions category. Motorcycle application remains unverified, and the stated state restrictions and professional-installation guidance matter.
Full product details
| Brand | MagnaFlow Exhaust Products |
|---|---|
| Included Components | MagnaFlow 94006 Universal Catalytic Converter |
| Inlet Connection Size | 2.5 inches |
| Item Dimensions | 18 x 7 x 4 inches |
| Item Weight | 4 pounds |
| Dimensions | 18 x 7 x 4 inches |
| Manufacturer | MagnaFlow Exhaust Products |
| Part Number | 94006 |
| Manufacturer Warranty Description | 5 Year / 50,000 Mile |
| Material | Stainless Steel |
| Model Number | 94006 |
| Outlet Connection Size | 2.5 inches |
Listed on Amazon as: MagnaFlow Universal Catalytic Converter 94006 (Federal/EPA Compliant)
View on Amazon#3 · Best Pre-OBDII Option
3. MagnaFlow 94009
- Weight: 5 lb
- Dimensions: 17.75"L x 7"W x 4.5"H
Best for: Pre-OBDII Universal Installations.
Why it ranks #3: It is identified as a universal, stainless-steel converter meeting federal EPA pre-OBDII requirements, though connection dimensions are not provided.
Pre-OBDII Federal EPA compliance is the defining specification of MagnaFlow’s 94009, identifying its emissions category for buyers working with a compatible older vehicle system. Its universal installation format allows placement in the location and orientation required by the vehicle, rather than specifying a motorcycle application.
Universal installation allows the converter to be placed in the location and orientation required for the vehicle, giving an installer flexibility within a compatible exhaust setup. Its stainless-steel construction is associated with durability, while the listing also identifies greater thermal efficiency. The EPA claim is specifically for Pre-OBDII emissions requirements, and the listing excludes California, Colorado, New York, and Maine. Professional installation is highly recommended; no motorcycle-specific dimensions or fitment are supplied.
- Designed to meet or exceed Federal EPA Pre-OBDII emissions requirements
- Universal installation permits location and orientation choices
- Stainless-steel construction
- Listing identifies greater thermal efficiency
- Professional installation is highly recommended.
Skip it if you need stated motorcycle dimensions or motorcycle-specific fitment; UNITHUB’s 2-inch inlet and outlet are specified, though not as motorcycle fitment.
This may suit a buyer seeking a universal converter for a compatible Pre-OBDII vehicle and professional installation. For a motorcycle, confirm the application independently: the listing supplies neither motorcycle fitment nor connection dimensions.
Full product details
| Brand | MagnaFlow Exhaust Products |
|---|---|
| Color | No Color |
| Dimensions | 17.75"L x 7"W x 4.5"H |
| Item Weight | 5 pounds |
| Manufacturer | MagnaFlow Exhaust Products |
| Model | Catalytic Converter 94009 |
| Model Number | 94009 |
| Output Voltage | 120 volts_of_alternating_current |
| Recommended Uses | Car, Truck |
| Warranty Description | 5 Year / 50,000 Mile |
Listed on Amazon as: MagnaFlow Universal Catalytic Converter 94009 (Federal/EPA Compliant)
View on Amazon#4 · Largest Connections
4. AP Exhaust 608227
- Weight: 7 lb
- Dimensions: 19"L x 4.5"W x 4.5"H
Best for: Three-Inch Universal Connections.
Why it ranks #4: Its universal-fit configuration lists 3-inch inlet and outlet diameters plus an oxygen sensor port, but those connections may not suit a motorcycle.
Specified 3-inch inlet and outlet diameters give the AP Exhaust 608227 a clear connection-size target for a compatible exhaust system. Its universal-fit configuration, ceramic substrate, stainless-steel body, and oxygen-sensor port describe the hardware, but the listing recommends it for cars rather than motorcycles.
The 3-inch inlet and outlet dimensions help identify whether this universal converter matches an existing exhaust connection, while its 19-inch listed length is another space consideration. A ceramic substrate and stainless-steel body specify its construction, and an oxygen-sensor port supports systems using that connection. The listing states no air tube and excludes sale or use in California or New York. Its recommended use is car, so motorcycle application is not established.
- Universal-fit configuration
- 3-inch inlet and outlet diameters are specified
- Ceramic substrate and stainless-steel body
- Oxygen-sensor port is included
- The listing recommends it for cars, not motorcycles.
Skip it if you need a converter expressly listed for motorcycle use; Davico 19217 is described as an exact-fit vehicle replacement, not a motorcycle part.
This is a candidate only where a compatible system needs 3-inch connections, a sensor port, and the listed length. Its car recommendation and California and New York restrictions are important boundaries for motorcycle buyers.
Full product details
| Brand | AP Exhaust Products |
|---|---|
| Color | Multi |
| Included Components | Catalytic Converter |
| Input Voltage | 15 volts |
| Dimensions | 19"L x 4.5"W x 4.5"H |
| Item Weight | 7 pounds |
| Manufacturer | AP Exhaust |
| Model | Catalytic Converter |
| Model Number | 608227 |
| Recommended Uses | Car |
| Additional Information | Important information |
Listed on Amazon as: AP Exhaust 608227 Catalytic Converter
View on Amazon#5 · Compact Construction
5. MagnaFlow 53956
- Dimensions: 14"L x 5"W x 5"H
Best for: Compact Weld-In Installations.
Why it ranks #5: Its listed 14-by-5-by-5-inch dimensions and compact, lightweight description may help in confined areas; inlet and outlet sizes are not stated.
Compact, lightweight construction is the defining feature of MagnaFlow’s 53956, with the listing identifying installation in confined areas as its practical advantage. It uses 16-gauge 409 stainless-steel tubing and requires welding, so buyers need both a space-compatible vehicle setup and a welding-capable installation plan.
The compact, lightweight format is intended for confined installation areas, which may help when space around a compatible exhaust system is limited. Welding is required, making installation a fabrication task rather than a simple stated bolt-on process. The 16-gauge 409 stainless-steel tubing is specified for corrosion resistance and service life, while the formulated catalyst blend is described as maximizing efficiency for emissions control. Federal compliance does not make this a motorcycle-specific part.
- Compact, lightweight construction for confined areas
- 16-gauge 409 stainless-steel tubing
- Catalyst blend is formulated for emissions control
- Federal EPA emissions compliance is stated
- Welding is required for installation.
Skip it if you cannot arrange welding; MagnaFlow 94009 offers universal installation without a stated welding requirement, though its dimensions are not supplied.
Choose it only if a compact space, welding access, and applicable Federal requirements suit your setup. Motorcycle fitment and connection dimensions are not stated, so the listing cannot confirm compatibility with a particular bike.
Full product details
| Brand | MagnaFlow Exhaust Products |
|---|---|
| Color | Silver |
| Dimensions | 14"L x 5"W x 5"H |
| Manufacturer | MagnaFlow Exhaust Products |
| Model | Standard Grade Series |
| Model Number | 53956 |
| Recommended Uses | Car |
| Warranty Description | 3 Years/ 36000 Miles |
Listed on Amazon as: MagnaFlow Universal Catalytic Converter 53956 (Federal/EPA Compliant)
View on Amazon#6
6. Davico 19217
- Weight: 14 lb
Best for: Exact-Fit Vehicle Replacement.
Why it ranks #6: This is an exact-fit automotive converter without listed connection dimensions, and its description does not establish universal or motorcycle compatibility.
Davico’s exact-fit design uses original-equipment sample parts as its basis, a feature intended to support proper fit and function on the specified vehicle. Its emissions-reducing catalyst is described for current OBDII demands, making this a vehicle-specific replacement candidate rather than a listed motorcycle converter.
The exact-fit approach is based on original-equipment sample parts, which can help buyers seeking a replacement matched to a particular vehicle rather than a universal installation. Davico says its catalyst is designed to meet current OBDII vehicle demands. The supplied information does not provide inlet or outlet dimensions, so it cannot establish fit for a motorcycle exhaust. Gaskets are not included, and the listing notes restrictions for California and certain New York applications.
- Exact-fit design uses original-equipment sample parts
- Designed to fit and function properly on its vehicle application
- Uses emissions-reducing catalyst
- Catalyst is described for current OBDII vehicle demands
- Gaskets are not included.
Skip it if you need a universal unit with stated connection sizes; AP Exhaust 608227 specifies 3-inch inlet and outlet dimensions.
It is best considered by a buyer replacing a converter on a compatible vehicle that benefits from an exact-fit design. For motorcycle use, the listing supplies no dimensions or motorcycle application, and gaskets must be sourced separately.
Full product details
| Brand | Davico |
|---|---|
| Item Weight | 14 pounds |
| Item model number | 19217 |
| Manufacturer | Davico |
| Part Number | 19217 |
| Dimensions | 20 x 8 x 18.25 inches |
Listed on Amazon as: Davico 19217 Catalytic Converter, 1 Pack
View on AmazonWhy a universal converter can still be the wrong fit
A universal label does not confirm that a converter will fit a motorcycle or meet its emissions requirements. The listings illustrate the sizing trap: UNITHUB specifies 2-inch inlet and outlet connections, MagnaFlow 94006 specifies 2.5-inch connections, and AP Exhaust 608227 specifies 3-inch connections. These are not interchangeable sizes, and even a matching diameter does not establish that the converter’s body will clear the bike or connect correctly to its exhaust.
Several listings describe automotive applications, and none of the supplied product information confirms motorcycle fitment. Before choosing, check the exhaust connection dimensions, available installation space, sensor arrangement, and the requirements that apply to your motorcycle and location.
Treat the listed federal or EPA descriptions as product-specific information, not proof that a converter is legal for every vehicle or jurisdiction.
Check emissions restrictions before installation
A converter’s stated federal or EPA compliance does not mean it is approved for use in every state or on every motorcycle. MagnaFlow 94009 and 94006 are described as pre-OBDII federal EPA converters and explicitly exclude California, Colorado, New York, and Maine. MagnaFlow 53956 says federal converters are not legal for sale, installation, or use in California and Colorado.
AP Exhaust 608227 says it is not for sale or use in California or New York, while Davico 19217 includes a restriction relating to New York vehicles with California emission systems. UNITHUB states EPA compliant but non-CARB compliant.
These differences make the relevant product’s own restrictions important; do not infer approval from another model in the same roundup. Confirm the rules for your motorcycle and location before buying or installing any option.
How to Choose a Motorcycle Converter
Inlet and outlet diameter
Look for a converter whose inlet and outlet diameters match the exhaust connections you have measured. This set spans 2 inches on UNITHUB UH-CC21001, 2.5 inches on MagnaFlow 94006, and 3 inches on AP Exhaust MagnaFlow 94009 and 53956 do not provide connection diameters in the supplied details, so their sizes need confirmation before they can be compared confidently.
A rider with measured 2-inch connections has the clearest match in the UNITHUB listing; someone with 2.5-inch connections can investigate MagnaFlow The 3-inch AP option only suits a setup with matching dimensions.
Do not assume an adapter or a similar-looking pipe makes a mismatched converter compatible.
Overall dimensions and available space
Compare the converter’s stated dimensions with the room available in the motorcycle exhaust system. UNITHUB lists a 13-inch overall length, MagnaFlow 53956 lists 14 by 5 by 5 inches, and MagnaFlow 94009 lists 17.75 by 7 by 4.5 inches. AP Exhaust 608227 is listed at 19 by 4.5 by 4.5 inches.
These measurements do not establish motorcycle fit, but they help identify which products need especially careful clearance checks. A rider with limited installation space may want to investigate the shorter listed options first, while someone with more room can consider longer bodies.
Confirm how the dimensions correspond to the actual mounting orientation and surrounding parts before choosing.
Sensor ports and listed restrictions
Check whether the converter’s sensor provision and legal-use restrictions suit your specific setup. UNITHUB and AP Exhaust explicitly list one oxygen sensor port or an oxygen sensor port, respectively; the supplied details for the other products do not confirm one. Federal and EPA descriptions also come with important limits: MagnaFlow 94009 and 94006 list restrictions for California, Colorado, New York, and Maine, while UNITHUB says it is non-CARB compliant.
AP Exhaust excludes California and New York, and MagnaFlow 53956 identifies California and Colorado restrictions. A bike whose exhaust requires a sensor port makes the explicitly listed options worth checking first.
A rider in a restricted state should verify the applicable rules and product approval before considering any converter, regardless of physical fit.
Which Converter Should You Choose for Your Motorcycle?
Start by confirming your motorcycle’s exhaust dimensions and whether a replacement converter is permitted for your bike and location. If your measured connections are 2 inches and the listed dimensions suit your installation, investigate UNITHUB UH-CC21001 first: it gives the clearest details, including an oxygen sensor port and heat shield. For matching 2.5-inch connections, consider MagnaFlow 94006, but check its stated state restrictions and motorcycle compatibility.
MagnaFlow 94009 may merit consideration when its pre-OBDII specification is relevant, but its connection sizes are not supplied here. AP Exhaust 608227 is a candidate only for a setup matching its 3-inch connections.
MagnaFlow 53956 has listed compact dimensions but needs sizing confirmation. Davico 19217 ranks last because motorcycle fit and universal sizing are not established.
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Frequently Asked Questions
How do I measure my motorcycle exhaust to check catalytic converter fit?
Measure the exhaust connection where the converter will join the pipe, and check the available installation length and surrounding clearance. Compare those measurements with the listing’s inlet, outlet, and overall dimensions when provided. For example, the first listing specifies 2-inch connections and a 13-inch overall length; confirm those suit your exhaust.
Can an automotive universal catalytic converter be used on a motorcycle?
Not automatically. A listing described as automotive does not confirm motorcycle fitment. Compare its connection dimensions and length with your exhaust, and check clearance, emissions requirements, and compatibility with your bike’s sensor setup.
The first listing has an oxygen sensor port, but you still need to verify that it suits your motorcycle.
What emissions rules apply to replacing a motorcycle catalytic converter in my state?
Rules depend on your location and motorcycle, so check applicable state requirements before replacing a converter. A listing’s EPA-compliant description does not establish that it is permitted for your particular bike or jurisdiction. Confirm the rules with the relevant state authority or a qualified emissions professional before purchasing or installing a replacement.
Why should I check for an oxygen sensor port?
Check whether your motorcycle’s exhaust and sensor setup requires a port and whether its position is suitable. The first listing specifies an oxygen sensor port, but the other product titles do not provide that detail. Do not assume a converter will work with your sensor setup based only on its title.
What should I do when a listing does not give connection sizes?
Treat fit as unconfirmed and seek the missing dimensions before choosing that option. The supplied listings do not provide connection sizes for every converter, so compare with your motorcycle’s measured exhaust and verify compatibility directly. Do not infer universal sizing or motorcycle fitment from a product title alone.
Final Words
Start with your motorcycle’s measured exhaust dimensions and confirm that replacement is permitted for your bike and location. If your connections are 2 inches and the stated dimensions fit, investigate the first-listed converter, while verifying its automotive description against your motorcycle’s needs. For other options, match the listed connection sizes where available and confirm any missing dimensions, sensor compatibility, clearance, and applicable emissions rules before deciding.
