Bolt ons along won't gain you anything if it's not loss power... I had 1/2 MD spacer, AEM CAI, Fast Intentions HFC, Fast Intentions Carbon Fiber catback on my G35 coupe. Oh yeah guess what, the car pulls so slow at low rpm. The only thing increases is the exhaust note... A tune is a MUST. But still, it won't get you 50hp on a NA car. Forced induction is the way to go.
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