Go with either long tube headers, or resonated test pipes. I went with non-resonated test pipes for the lightest possible weight, but the rasp is terrible!
Stillen gen 3's have nice proven gains, but there's also the Nismo long tube intake.
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-'11 Gun Metallic Nismo 370z
-'12 WRB STi hatch
-'99 2.5RS coupe
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