Project GD STI, Fixing all the Details!

We adjusted the shifter for the lowest motion ratio for the longest throws.   We don’t like super short throw shifters and they are harder on synchros.   Cobb gives you the choice to adjust the motion ratio to your own personal preferences.

We had to slightly modify the bracket for our IAG AOS to move it down about a quarter inch to clear our Cusco strut tower brace.  It still fits very nicely as IAG intended.

We also ran IAG’s fuel pressure regulator which is designed to be run with Cobb’s flex-fuel system.  It plugs in perfectly with no cutting and messing around.

We used IAG’s top feed fuel rail kit for our 1300cc Cobb Injector Dynamics injectors.


  1. I don’t think you are correct about the surge tank being mounted higher than the factory one. It’s mounted lower than the top of the cobb AF box and the stock is mounted almost level with the top of the intake plenum.

    It looks nice no doubt but it’s not higher than the stock one.

    1. We had a stock STI in the shop that I could actually measure and you are right, the top of the OEM tank is higher. The bottom of the IAG tank when the hoses attach is higher than the OEM tank bottom. The main reason we used it is to clear the process west intake manifold. Thank you for pointing this out and I edited the story to reflect this.

  2. Hi Mike!
    Do you think the lack of increased NVH from the IAG mounts maybe because of the increased chassis stiffness from the Cusco bracing? It would be interesting to test this out with and without the braces.

      1. Apologies, I did not mean for you to test it yourself, as I am aware you must have a busy schedule. I was just thinking out loud as that would be an interesting data point to test in the future ( possibly by me ). I do appreciate theses awesome articles you and your team have put together for free and I am building my STi very close to your build which is why I love to geek out on this stuff 🙂

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