Hi, i was thinking about purchasing the Injen exhaust, ztube, popcharger combo from conceptzperformance.com for around 950$. I have heard many negative things about the popcharger though so i am planning on selling it on here somewhere and getting a k&n drop in filter instead. Do you guys think this is a good deal for me to pursue for the HP / sound gains? Does anyone have any experience with the Injen Exhaust?