ISR Tubular Bottom Mount Manifold - Nissan SR20DET - Version 3 SCH40 With Great Success of the ISR V2 SR20DET Manifold they have released a brand new Schedule 40 Weld-El Bottom Mount Manifold. The Version 3 manifold is an upgrade over almost all other bottom mount manifolds. Utilizing thicker Schedule 40 Weld-El Piping. With all the OEM replacement manifolds on the market, choosing one that is going to last can be a big issue. With this manifold you can upgrade to more horsepower and still keep piece of mind. And, with the ISR high quality standard in mind, you know you'll be getting an excellent product. Note: on some T25 or T28 stock turbos, you may need to clock the turbo slightly to clear the larger runners on this manifold. ** All ISR Performance Products are Designed for Off Road Use Only **