I am running the stock Nismo exhaust with the FI res test pipes. I also removed the Resonators from the Nismo exhaust before doing so. It makes the worst Rasp noise I have ever heard! Cant stand it. I am getting my FI exhaust installed on DEC 14th and this should eliminate the Rasp! The Nismo exhaust is not made for all that air coming through it once you put the Test Pipes on. At least that is what FI is telling me. They said once I go with the true dual exhaust the rasp will go away. You cant get rid of the hiss, that is part of the car.
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