Also, if you haven't "opened up" your exhaust a bit more, you should do that at least. No good if your car can't blow out all the air it sucks in. 
02 Nissan Altima 3.5 SE, FULLY LOADED
Old car- 99 SE Sport ATX w/ SVT body kit (for sale...asking $4,200 OBO), nicely modded, high-flow exhaust y-pipe back and KKM. 95K, but 95% are interstate highway miles back and forth to college everyday.
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