I recently installed an O/R prochamber on my 05 GT. I like the way it sounds when Im shifting and letting off the gas. The throttle response is much better and it feels like its got some more HP and TQ. I have the Mac axel backs also installed. My problem is, it has lost some of the deepness and has some trumpeting/raspiness to it. Ive seen hi flow cats from $70 to almost 200 bucks each. Do any of you have some good info on what differences there are between different cats. Or should I just save the money and chop my old ones back on, but after looking at them they seem so restrictive. Thanks in advance.

 

Not sure about brand, but dont get cats that have a ceramic brick in them, get the ones that are spun steel...I have been through 2 jba high flow cats in 3 months. The ceramic ones are too brittle....