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DormanPart #: 678-504
Dorman 678-504 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
$503.94Free 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: INFINITI and Nissan, I30 and 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 678-504 Catalytic Converter - Front
| Brand | Dorman |
| Part Number | 678-504 |
| Outlet Outside Diameter | 4.5 |
| Mounting Hardware Included | Yes |
| Universal Or Specific Fit | Specific |
| Grade Type | Regular |
| Body Shape | Cylinder |
| Inlet Type | Flanged |
| Outlet Type | Flanged |
| Inlet Inside Diameter | 3.24 |
| Body Height | 8 |
| Body Length | 4 |
| Body Width | 4 |
| Heat Shield Attached | Yes |
| Inlet Quantity | 1 |
| Body Material | Stainless steel |
| Outlet Inside Diameter | 2.05 |
| Outlet Quantity | 1 |
| California Air Resources Board (CARB) Certified | Yes |
| Substrate Material | Ceramic |
| Inlet Mounting Hole Quantity | 3 |
| Inlet Mounting Hole Quantity | 5 |
| Inlet Gasket Included | Yes |
| Inlet Mounting Hardware Included | No |
| Outlet Mounting Hole Quantity | 3 |
| Outlet Gasket Included | Yes |
| Outlet Mounting Hardware Included | Yes |
| Overall Length | 10.5 |
| Air Tube Count | 0 |
| Sensor Port Count | 1 |
| New York Certified | Yes |
| CARB Compliant | Yes |
This part fits 6 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2001 | INFINITI | I30 | 3.0L | V6 | Front | CARB Compliant: Yes |
| 2001 | Nissan | Maxima | 3.0L | V6 | Front | CARB Compliant: Yes |
| 2000 | INFINITI | I30 | 3.0L | V6 | Front | CARB Compliant: Yes |
| 2000 | Nissan | Maxima | 3.0L | V6 | Front | CARB Compliant: Yes |
| 1999 | INFINITI | I30 | 3.0L | V6 | Front | CARB Compliant: Yes |
| 1999 | Nissan | Maxima | 3.0L | V6 | Front | 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:
B08A03Y102
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.