ISR Performance Version 2 Bottom Mount Turbo Manifold - Nissan SR20DET S13/S14

The ISR Performance Version 2 bottom mount turbo manifold for the Nissan SR20DET is a replacement exhaust manifold for the S13 and S14 240SX that keeps the turbo in the factory low mount location. It is the updated second version of ISR's bottom mount SR manifold, built for owners who want improved flow over the stock cast log without relocating the turbo.

Why bottom mount

A bottom mount layout keeps the turbo where Nissan put it, down low alongside the block. That preserves hood clearance, keeps heat away from the intake side, and lets you reuse factory style intake, O2 housing and downpipe routing. Top mount manifolds offer more turbo flexibility but need more supporting parts. For a street or drift SR that is staying with a T25, T28 or similar framed turbo, bottom mount is the straightforward choice.

What you get over stock

• Runner design aimed at better flow than the factory cast manifold
• Factory turbo placement so existing plumbing lines up
• ISR Version 2 revision of the bottom mount SR manifold

Fitment

Nissan SR20DET in the S13 and S14 240SX.

Install guidance

Use a fresh manifold gasket and turbo gasket, and inspect the exhaust studs on the head while the old manifold is off. Replace any that are corroded or stretched. Check clearance to the heat shield, oil feed and coolant lines once the turbo is bolted up, and retorque the manifold nuts after a few heat cycles.

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