ISR Performance Stainless Steel 3" O2 Housing - Nissan RB25 Swap (Uses SR Style Downpipe)

Swap an RB20 or RB25 into an S-chassis and the factory turbine outlet runs straight into the left hand drive steering column. The ISR Performance stainless steel 3 inch O2 housing solves that problem: it replaces the restrictive factory turbine outlet on the RB25DET with a full 3 inch housing that clears the steering column when the engine is installed on ISR swap mounts, and it puts the downpipe in the standard SR location so a regular S-chassis SR downpipe mates to your existing exhaust components.

Performance Benefit

The factory RB outlet is a restriction. A full 3 inch oval to round transition improves spool and top end flow, and the thick flange resists warping under heat. An O2 sensor bung is included. Pair it with an ISR 3 inch downpipe for a complete turbo-back setup.

Specifications

• Stainless steel construction with a new brushed finish
• Oval to 3 inch round transition
• Standard SR downpipe location
• Thick flange, bolts to the factory RB25 turbo
• O2 sensor bung

What Is in the Box

• 1x ISR RB20/25 O2 housing
• 1x 3 inch 3 bolt gasket
• 1x 6 bolt turbine discharge gasket
• 3x exhaust studs
• 3x nuts

Fitment Notes

Made for RB20 and RB25 engines swapped into a Nissan 240SX to clear the LHD steering column shaft when using the ISR swap mounts. Also suits R33 Skyline RB25 applications. Includes gaskets for turbine and downpipe and studs and nuts for the downpipe; hardware for the turbo is not included.

All ISR Performance products are designed for off-road use only.