Im not sure why you guys are hating, but OP's friend is absolutely right.
If you think this 30 whp gain for 5000 is not a waste then you should ride an EVO or STI to show you what they can do with 5000.
Im speaking from experience, I went from full bolts on with tune except headers all the way to turbo on same car G37 Coupe. I went with TT because I felt nothing.. no harder pulls no neck breaker no nothing!!
"IF" I wanna stay NA, I would sell my intakes and test pipe and go back to stock just leaving aftermarket exhaust and not because of gains but because of sound.
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