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DormanPart #: 678-521
Dorman 678-521 Catalytic Converter - Front
⚙️ 6 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$925.18Free 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
🚗Fitment: Nissan, Maxima
🔄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? Click here for all Catalytic Converter options
Dorman 678-521 Catalytic Converter - Front
| Brand | Dorman |
| Part Number | 678-521 |
| Material | Acero inoxidable |
| Material | Stainless steel |
| Inlet Outside Diameter | 4 |
| Outlet Outside Diameter | 4.4 |
| Clamps Included | No |
| Clamps Included | Non |
| Finish | Natural |
| Mounting Hardware Included | Oui |
| Mounting Hardware Included | Sí |
| Mounting Hardware Included | Yes |
| Universal Or Specific Fit | Específico |
| Universal Or Specific Fit | Specific |
| Grade Type | Reemplazo estándar |
| Grade Type | Standard replacement |
| Tube Material | Acero inoxidable |
| Tube Material | Stainless steel |
| Hangers Included | No |
| Hangers Included | Non |
| Body Shape | Cilindro |
| Body Shape | Cylinder |
| Inlet Type | Embridado |
| Inlet Type | Flanged |
| Outlet Type | Embridado |
| Outlet Type | Flanged |
| Inlet Inside Diameter | 3.79 |
| Body Height | 4 |
| Body Length | 4 |
| Body Width | 3.87 |
| Heat Shield Attached | No |
| Heat Shield Attached | Non |
This part fits 6 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2014 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
| 2013 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
| 2012 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
| 2011 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
| 2010 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
| 2009 | Nissan | Maxima | 3.5L | V6 | Front | CARB Executive Order Number: D-798-9 |
* 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:
208A34RF0A208A39N70A551128
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.