I have a 3"DP mid pipe no cats or siancers and a racingbeat catback and its plenty quiet I dont think ill buy any other catbak there mufflers are awsome!!!!

 

I have a racing beat turbo back. Awesome product. . no complaints
Dom

 

apexi gt-spec is so amazing sounding i dont think i would even ever bother with rb. the only prob is the fact that the resinator sticks like 2 inches below everything else and likes to hit things and is the reason why i cant lower my car anymore . plan-im getting a 3 inch ss flange, " " tubing, cutting it after the resinator, and moving the resinator forward and up in place of where there is more room, the cat area. itll eliminate the lowness of it and get rid of the stupid tapering.

 

I have the RB system, it's nice and quiet when you want it to be and sounds great when you're running it hard.

 

I also have a RB system. I wouldn't trade it for anything.