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do a CAI, it's quite a bit cheaper than exhaust and you'll instantly be able to hear and feel a difference in throttle response and engine tone. I gained 3 peak whp from my K&N cone on my 2.2 liter, but, more importantly, I gained upto 4 or 5 hp at various points in the powerband, mostly the middle. I still have stock exhaust, though, so when i upgrade my exhaust i should get a few more HP.
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