Question for all.
Have a 2006 4.0 and I'm thinking about putting headers and the exshaust onthe stang. I will have to have them installed. Should I do the off-road X pipe or just have them hooked to the cats? I will have the total performance package done with the cold air intake and a tuner. I'm a newbie and just don't know about these things.

 

O/R X sounds excellent. Check out my track video in my sig.

 

our 4.0s sound like crap without cars unfortunately......id only go catless if you were shooting for highest HP numbers but other than that id keep them on