Catalytic Converter for Nissan Altima (2007-2008) 3.5L

Direct-Fit Replacement Catalytic Converter for 2007-2008 Nissan Altima

What it Does: The catalytic converter replaces degraded factory emissions assemblies on the 2007-2008 Altima to normalize exhaust scavenging, reduce tailpipe emissions, and eliminate catalyst efficiency trouble codes.

The Stock Nissan Altima Catalyst Substrate Degradation

Factory exhaust units on the fourth-generation L32 Altima endure relentless thermal cycling and high exhaust gas temperatures from the high-displacement V6. Over time, the internal ceramic honeycomb substrate experiences sintering, cell fracture, and catalytic washcoat deactivation. This structural breakdown increases exhaust backpressure, chokes volumetric efficiency at higher RPMs, and triggers persistent P0420/P0430 diagnostic trouble codes as downstream oxygen sensors detect sub-threshold conversion efficiency.

The Engineering Solution

Engineered to restore factory exhaust velocity and emissions compliance, this direct-replacement assembly features a high-grade stainless steel outer shell designed to withstand road salt, thermal expansion, and mechanical vibration. Inside, a durable, high-flow ceramic substrate is treated with a resilient precious-metal washcoat optimized for hydrocarbon and NOx reduction without creating parasitic exhaust backpressure. Precision-machined, thick-gauge mounting flanges ensure leak-free mating to existing manifold and intermediate pipe joints, eliminating exhaust blow-by. Supplied with new gaskets and mounting hardware, it restores proper sensor feedback to the engine control unit without requiring custom cutting or welding.

Technical Specifications

Compatibility

• 2007 Nissan Altima 3.5 SE Sedan / Coupe (3.5L V6 VQ35DE)
• 2007 Nissan Altima 3.5 SL Sedan (3.5L V6 VQ35DE)
• 2008 Nissan Altima 3.5 SE Sedan / Coupe (3.5L V6 VQ35DE)
• 2008 Nissan Altima 3.5 SL Sedan (3.5L V6 VQ35DE)

Frequently Asked Questions

Does this fit the L32 Altima?
Yes, this is a direct fit for the 2007-2008 Nissan Altima equipped with the VQ35DE 3.5L engine.

Will this resolve a P0420 or P0430 diagnostic trouble code?
Yes, assuming no upstream engine misfires or exhaust leaks exist, this fresh substrate restores proper catalytic reduction to clear catalyst efficiency codes.

The Nissan Powertrain Standard

The high-revving VQ35DE platform demands uncompromised exhaust flow to maintain its aggressive mid-range torque curve and signature exhaust tone. Installing an unrestrictive, direct-fit replacement converter ensures optimal backpressure control and emissions compliance without sacrificing mechanical responsiveness.