Cat Back Exhaust for Nissan 240SX S13 (1989-1994) 2.4L

High-Flow Cat Back Exhaust for 1989-1994 Nissan 240SX

What it Does: The cat-back exhaust system replaces the restrictive factory exhaust piping and baffled muffler on the 1989-1994 Nissan 240SX to lower exhaust backpressure, optimize cylinder scavenging, and increase exhaust gas velocity.

The Stock Nissan 240SX Flow Restriction and Corrosion Weakness

The original exhaust assembly fitted to the S13 platform relies on narrow, crush-bent aluminized steel tubing routed through restrictive internal baffle chambers. Over decades of operation, thermal cycling and moisture accumulation degrade the mild steel from the inside out, leading to pinhole leaks, rusted flange joints, and failed exhaust hangers. Functionally, the stock bottlenecks create excessive backpressure behind the naturally aspirated KA24E and KA24DE powerplants, choking high-RPM gas evacuation and blunting throttle response.

The Engineering Solution

This direct-fit cat-back exhaust is constructed from high-grade, polished stainless steel to prevent rust and withstand prolonged thermal stress. The system utilizes continuous 3-inch mandrel-bent tubing to maintain uniform cross-sectional diameter throughout bends, eliminating flow turbulence and friction loss. High-strength welded flanges mate to the catalytic converter assembly, while pre-positioned OE-style hangers anchor directly to factory chassis rubber isolators. Flow transitions into a straight-through performance muffler with a 2.5-inch outlet tip, balancing acoustic resonance control with unimpeded exhaust flow for measurable gains across the mid-to-high powerband.

Technical Specifications

Compatibility

• 1989-1990 Nissan 240SX Base / SE / XE Hatchback & Coupe 2.4L SOHC (KA24E) S13
• 1991-1994 Nissan 240SX Base / SE / LE Hatchback, Coupe & Convertible 2.4L DOHC (KA24DE) S13

Frequently Asked Questions

Does this fit the S13 240SX?
Yes, this is a direct fit for the 1989-1994 Nissan 240SX equipped with the KA24E or KA24DE engine.

Does this bolt-on cat-back exhaust require ECU tuning or cut-and-weld modification?
No ECU recalibration is required, and the system bolts directly to the factory catalytic converter flange using supplied hardware.

The Nissan JDM Tuning Standard

Built for the demanding tolerances of the S13 chassis, this exhaust delivers the low-restriction acoustic clarity and high-RPM power support required by Nissan rear-wheel-drive performance builds.