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OE Quality
60-Day Returns
DormanPart #: 678-537
Dorman 678-537 Catalytic Converter - Rear
5 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$1,349.40Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
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*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
Fitment: Mazda, 6
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? See all Catalytic Converter options
Dorman 678-537 Catalytic Converter - Rear
| Brand | Dorman |
|---|---|
| Part Number | 678-537 |
| Outlet Outside Diameter | 5.11 |
| Finish | Natural |
| Mounting Hardware Included | Yes |
| Universal Or Specific Fit | Specific |
| Grade Type | Regular |
| Body Shape | Cylinder |
| Inlet Type | Flanged |
| Outlet Type | Flanged |
| Inlet Inside Diameter | 1.83 |
| Body Height | 3.1 |
| Body Length | 7 |
| Body Width | 3.9 |
| Heat Shield Attached | No |
| Inlet Quantity | 1 |
| Body Material | Stainless steel |
| Outlet Inside Diameter | 3.72 |
| Outlet Quantity | 1 |
| California Air Resources Board (CARB) Certified | Yes |
| Substrate Material | Ceramic |
| Inlet Mounting Hole Quantity | 2 |
| Inlet Gasket Included | No |
| Inlet Mounting Hardware Included | Yes |
| Outlet Mounting Hole Quantity | 4 |
| Outlet Gasket Included | Yes |
| Outlet Mounting Hardware Included | Yes |
| Overall Length | 12.5 |
| Air Tube Count | 0 |
| Sensor Port Count | 1 |
| New York Certified | Yes |
| CARB Compliant | Yes |
This part fits 5 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2013 | Mazda | 6 | 3.7L | V6 | Rear | CARB Compliant: Yes |
| 2012 | Mazda | 6 | 3.7L | V6 | Rear | CARB Compliant: Yes |
| 2011 | Mazda | 6 | 3.7L | V6 | Rear | CARB Compliant: Yes |
| 2010 | Mazda | 6 | 3.7L | V6 | Rear | CARB Compliant: Yes |
| 2009 | Mazda | 6 | 3.7L | V6 | Rear | CARB Compliant: Yes |
* 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:
CA0120600C
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.