ISR Performance Tubular Bottom Mount Manifold - Nissan SR20DET - Version 3 SCH40

The ISR Performance Version 3 Tubular Bottom Mount Manifold for the Nissan SR20DET is the follow-up to the popular ISR V2 manifold, and the big change is the material. The V3 is built from thicker Schedule 40 weld-el piping, which puts it ahead of almost every other bottom mount SR20DET manifold on the market in terms of wall thickness and resistance to cracking.

Why Schedule 40 matters

Bottom mount manifolds live a hard life. They carry the weight of the turbo, see huge temperature swings, and are the first thing to crack on a lot of cheaper tubular designs. With so many OEM replacement manifolds to choose from, durability is the real question. Thicker Schedule 40 weld-el runners give this manifold the strength to support more horsepower while keeping the peace of mind that it will still be in one piece next season. It is built to the ISR quality standard their other SR20DET parts are known for.

Key points

• Tubular bottom mount design for the SR20DET
• Schedule 40 weld-el construction, thicker than the V2 and most competitors
• Keeps the factory bottom mount turbo location
• Suited to stock replacement or a higher-horsepower turbo build

Fitment

Nissan SR20DET engines, as found in the S13 and S14 240SX swap platforms.

Install note

On some stock T25 and T28 turbos, you may need to clock the turbo slightly to clear the larger runners on this manifold. Plan for that during mock-up before final assembly.

Legal in California only for racing vehicles which may never be used, or registered or licensed for use, upon a highway.

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