I want to run catted h or x pipes to my stock manifold. Which ones will fit the best and give the best sound and performance?

07 gt. cmdp, jlt2 cai, steeda udp, flowmaster thunder, 4.10s

 

trying to make a decision.... magnaflow tru-x-x, bbk, ???? these are the only two that says it fits stock manifold.. any others, and which one is better?

 

I know you know this, but you already have catted H on your car, so it would be a wise decision to go with a catted X.
Unless you want to switch to a high flow catted H, but there aren't many of them out there, you either have to go with MRT or fabricate your own.

Many people are using Bassani or Magnaflow.

 

If you plan on keeping the flows ,id stay away from an X pipe as it will tend to sound raspy! as far as i know MRT makes the only direct fit catted H pipe..but you could do like i did and get a pypes O/R H and just weld-in some hi-flow cats! from personal experience i can say the flows sounded pretty decent with the catted H...but not so good with the catted X.

 

^^^
+1