Originally Posted by HustlerX5

Nick,

I am happy to inform you that there would be no need for that resonator as the TDX system paired up with the high flow cats has NO RASP what so ever, I'm the owner of the car they are using to prototype the TDX system and I finally got to hear the finished product with high flow cats yesterday and man, all I have to say as far as sound/performance goes is..... "99 problems but Berk ain't 1" hahahahaha! I'M ONLY TEASING, so please don't start a flamewar. but anyway with the High Flows installed it's almost the exact same beautiful tone as just the TDX alone just with a little added "Ooomph" meaning slightly louder, yet somehow strangely maintains the "no drone" rolling around the city at 40MPH on 6th gear, at least as per MY test drive of the Z.