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WalkerPart #: 16861
Walker 16861 Catalytic Converter with Integrated Exhaust Manifold
⚙️ 4 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$756.40Free Shipping
🚚Free ShippingNo Cost to Continental U.S.
🔄Free Returns*Wrong fit? No cost
🛡️60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
🔥
✅ In Stock · Ready To Ship
Most orders ship same-day if ordered before 1pm CST.
✅OE Direct Replacement — Bolt-on fit, no modifications needed
📦EPA
🚗Fitment: Mazda, 3
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST
Walker 16861 Catalytic Converter with Integrated Exhaust Manifold
| Brand | Walker |
| Part Number | 16861 |
| Position | EPA |
| Grade Type | Regular |
| Converter Body Length | 6.25 |
| Inlet Quantity | 1 |
| Outlet Quantity | 1 |
| California Air Resources Board (CARB) Certified | No |
| Substrate Material | Ceramic |
| Overall Length | 36.03 |
| Converter Body Material | Stainless steel |
| Outlet Port Shape | Round |
| Inlet Port Shape | Round |
| Body Height | 4 |
| Body Length | 6.25 |
| Body Shape | Round |
| Body Width | 4 |
| Converter Quantity | 1 |
| Inlet 1 Type | 7 bolt welded flange |
| Inlet Type | 7 bolt welded flange |
| Material | Stainless steel |
| Mounting Hardware Included | Yes |
| Outlet Type | 2 bolt welded flange |
| Oxygen Sensor Location | Pre and post catalyst |
This part fits 4 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2013 | Mazda | 3 | 2.5L | L4 | N/A | Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional Part(s) Needed To Complete Installation: 31540; Ultra Type; EPA |
| 2012 | Mazda | 3 | 2.5L | L4 | N/A | Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional Part(s) Needed To Complete Installation: 31540; Ultra Type; EPA |
| 2011 | Mazda | 3 | 2.5L | L4 | N/A | Fits Fed. & Calif. Emission Models; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional Part(s) Needed To Complete Installation: 31540; Ultra Type; EPA |
| 2010 | Mazda | 3 | 2.5L | L4 | N/A | From 07/01/2010; with Federal Emission System; Not legal for sale or use in California and other CARB-compliant states. Legal in New York and Maine on EPA Federal Emission Equipped Vehicles only. Consult the aftermarket converter regulations in your state for details.; Exhaust Gasket is Recommended; Additional Part(s) Needed To Complete Installation: 31540; Ultra Type; EPA |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
51440641483
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.