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Originally Posted by yota_head
you will lose low end and maybe gain top end.
your engine needs a little bit of backpressure for scavenging purposes.
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Indeed. From what I have come up with on the N/A's ,a 2 1/2" exhaust is the most you want. Or some have said ,if you know someone with a turbo upgrading ,get that off them and swap it on. I don't imagine your cleaned out cat would have a negative effect with the other elements in place. Unless you took off the resonator and have a more free flowing muffler on there.
