Dorman 678-521 Catalytic Converter
Confirm Fitment Before You Buy
Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
Regular price
$869.00
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Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.
Product Description
This catalytic converter is precision-engineered to match the original equipment fit and function on specific vehicle years, makes and models for a reliable replacement.
- Direct replacement - this catalytic converter is designed to match the fit and performance of the original equipment on specific vehicles
- Durable construction - manufactured within strict tolerances for reliable longevity
- Cost-effective solution - offers original equipment functionality at a competitive price
- Trustworthy value - backed by team of engineers and quality control experts in the United States
Detailed Applications
| Year | Make | Model | Configuration | Positions | Application Notes |
|---|---|---|---|---|---|
| 2014 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) ENSXV03.5G7B |
| 2013 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) DNSXV03.5G7B |
| 2012 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) CNSXV03.5G7B |
| 2011 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) BNSXV03.5G7B |
| 2010 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) ANSXJ03.5G7A |
| 2009 | Nissan | Maxima | V6 3.5L (3498cc) | Front | CARB Compliant: Yes; Engine Family Number (EFN) 9NSXV03.5G7A |
Product Specifications
| Air Tube Count: | 5 |
|---|---|
| Body Height: | 4 in |
| Body Length: | 4 in |
| Body Material: | Stainless Steel |
| Body Shape: | Cylinder |
| Body Width: | 3.87 in |
| California Air Resources Board (CARB) Certified: | Yes |
| California Air Resources Board Approved: | Yes |
| CARB Compliant: | Yes |
| Clamps Included: | No |
| Color: | Metallic Gray |
| Converter Body Length: | 4 in |
| Converter Body Material: | Stainless Steel |
| Converter Quantity: | 1 |
| Exhaust Manifold Inlet Port Shape: | Round |
| Finish: | Natural |
| Gasket Or Seal Included: | Yes |
| Grade Type: | Standard Replacement |
| Hangers Included: | No |
| Heat Shield Attached: | No |
| Heat Shield Material: | Stainless Steel |
| Inlet Gasket Included: | Yes |
| Inlet Inside Diameter: | 3.79 in |
| Inlet Mounting Hardware Included: | No |
| Inlet Mounting Hole Quantity: | 6 |
| Inlet Orientation: | Angled |
| Inlet Outside Diameter: | 4 in |
| Inlet Port Shape: | Round |
| Inlet Quantity: | 1 |
| Inlet Type: | Flanged |
| Installation Hardware Included: | Yes |
| Item Grade: | Standard Replacement |
| Material: | Stainless Steel |
| Mounting Hardware Included: | Yes |
| New York Certified: | Yes |
| Outlet Gasket Included: | Yes |
| Outlet Inside Diameter: | 1.89 in |
| Outlet Mounting Hardware Included: | Yes |
| Outlet Mounting Hole Quantity: | 2 |
| Outlet Orientation: | Straight |
| Outlet Outside Diameter: | 4.4 in |
| Outlet Port Shape: | Round |
| Outlet Quantity: | 1 |
| Outlet Type: | Flanged |
| Overall Length: | 9.2 in |
| Oxygen Sensor Location: | Post Converter |
| Package Contents: | 1 Converter Assembly; 1 Inlet Gasket; 1 Outlet Gasket; 8 Bolts; 8 Washers |
| Package Quantity: | 1 |
| Packaging Type: | Box |
| Sensor Port Count: | 1 |
| Substrate Material: | Ceramic |
| Tube Material: | Stainless Steel |
| Tube Wall Thickness: | 0.125 in |
| Type: | Flanged |
| Universal Or Specific Fit: | Specific |
| CARB Executive Order Number: | D-798-9 |
OE Numbers
| DIRECT OE CROSS | |
|---|---|
| 208A34RF0A | NISSAN |
| 208A39N70A | NISSAN |