you're not going to feel any change in power from doing intakes. test pipes are a pain the arse to install but do yield a nice gain in hp. like stated above your best bet is to do the intakes. when/if you decide to the exhaust then you can do the test pipes (if you don't have emissions where you live). you feel the gains once you tune your car.
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2 plus 2 times 2 = ? ... hint, it's not 8 
Stillen CBE, Stillen Gen 3, TP's, Uprev tuned - 324whp/264tq
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