IMO the oem RCF axle back section gives the best tone all around. Its not to loud and gives a nice rumble at lower rpms. just enough to know its there. The quad tips look great on our cars. im planning on changing the tips for a little more agressive look. HP wise it maybe gained 1-2. wasnt looking for much in that dept on a all motor car

 

How do you like it?

I have a PPE downpipe, Invidia Midpipe and the same Invidia axle back and the cold start is ****ing loud. Really hope it tones down after I get more miles on it.