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I think the bottleneck in the exhaust only make tiny to no difference in power weather you're na or fi. If you feel it does slow you down take the silencers off and you'll probably feel more difference. I have taken off the silencers but it makes the car alot louder but the turbos did spool up a little faster but to me it's too loud like the APS 3" sound.
shipped to 17003 ( will fit an 08 z ) ????? thanks.... also do you have any test pipes for the z and the injen cold air intake system..all that shipped to 17003
i just put these on my 08Z... took silencers off.... sounds great. and you will feel a power improvement... also higher gas mileage on the highway... Bump for a great sell...