The Full Bolt on SR20 Engine, Part One, The Basics

The turbine flange is thick for warp resistance and has gussets to reinforce its connection to the collector.

This bracket connects the turbine flange to the main flange to help fully support the weight of the turbo.  These impressive features should make for a manifold that is highly crack-resistant.

The manifold’s collector is smoothly merged and welded from the inside and the outside for crack resistance. After welding the entire area is hand-finished for smooth flow.  We are impressed with the collector fabrication and are amazed that this can be done at ISR’s price point.

Every primary tube weld is hand-finished as well.  The ISR manifold has more features than any more expensive domestic or Japanese manifold that we have yet to see! With near-equal length, smooth bends, and a merged collector, it should help produce fast spooling and more power to boot!

Our car already had a fabricated aftermarket 02 sensor housing but we decided to go with this greatly improved ISR part.  The ISR housing has a smooth investment cast stainless steel body, for maximum internal area and the lowest possible backpressure over necked down fabricated or the stock part.


    1. What we wanted was inexpensive, simple and the ability to combine with any lash up of OEM and aftermarket parts to make this a pure bolt on with no fabrication needed. We know about Artec stuff, it just doesnt meet any of those criteria.

  1. Hey Mike!

    Great information!

    Question. If you were to choose between the GEN 2 GTX, 2860r or 2867r for this build, what is your pic?

    Thanks! D

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