i have the 18" resonated CBE and it is louder than stock, minimal cabin noise (noticable in cabin noise at 2-2300 rpm), and sounds great WOT! i recently installed the RTP and it sounds even better! deeper tone, not much increase in cabin noise during cruising (even on highways at +70 mph), but loud w/cold starts...
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Fly1 Zele|Stillen G3|FI CBE 18" RES w/quad tips|FI RTP|UpRev|IJDM LED Halos|6k HIDs|LEDs|JDM PW Shifter|NAVTOOL V2
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