i have stillen cbe and test pipes, but they aren't ART. it sounds decent. when i had just the stillen cbe, there was zero rasp/drone. with the tp's there is some rasp usually 2,500-3,200 range. especially when the car is not warm. however, if you gun it from the rasp goes away. so normal driving there would be rasp
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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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