Have you looked at Andy Forrest's website as it gives some guidance to what is required for certain gains, I used it as a guide when I first got my car.
I have milltek centre resonated section and back box on mine because they are quiet, I have decatted and got RCM manifolds on mine. Changing the manifold and up pipe made it a lot louder. Can't remember what Dave (Ginola) had on his STI, that sound nice, straight exit and looks well built.
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