i think on the exhaust it depends on how loud you want it to sound. i have stillen g3's and a stillen exhaust. i have no regret with the exhaust as i didn't want a loud exhaust, but it gives nice gains. also if you go on the stillen website they don't only offer stillen products, they have others as well.
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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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