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ive heard they dont do much for power gains...but they arent that expensive so why not..

www.optauto.com
www.inlinefour.com
www.importhorizon.com

you should be able to find some good prices on there. good luck and let us know how much of a difference it makes after you get it :)
 

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i use to run a test pipe and that made a lot of HP! i based this not on how it felt, but on the results of a race with a friend. i was able to improve by a car and a 1/2 in result of the test pipe. as for the high flow cat converter, im pretty sure but it will gain some HP (2-3 to the wheel). just make sure it comes w/ an o2 sensor plug. ;)
 
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