Man, I noticed a big increase when I removed my ring. Then I straight piped it and that increased it a little, then I put the Amsoil nanofiber 4510 on and it really sings now. (on a side note, the Amsoil 4510 made the turbo louder, but the engine noise noticeably quieter?!?). Is there any chance your resonator is plugged up?
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