Originally Posted by jimbamsey
I just installed my offroad h pipe and flowmaster american thunder catback system on my car. I got a great deal from a guy who was selling a pile of aftermarket mustang stuff since he sold his car. I will say that it does sound excellent. I'm not sure if I want to keep it on there since there was such a noticable loss of low end power. I've read a handful of forums on this and there is some debate, but this is not debatable. I could two hours earlier stomp on the throttle in first just about anywhere and break the tires loose, and sometimes in second. Now it just pukes and eventually livens up and goes pretty good. I do think there is some top end performance gains.
To be fair I wasn't aware I would extensions for the front o2 sensors and those regulate air fuel mixture and could be throwing things way outta wack. I will have them tomorrow to see for sure.
I'm looking for feedback from anyone who's been in this predicament, do I put in a set of aftermarket cats and split the difference between sound and low end? Is there really anything other than major internal work that will bring back the low end torque I'm already starting to miss, or ditch the H pipe and go back to a good ol' stocker? Thanks!
ive never heard of anyone noticing a HUGE difference. some people say its very minimum/negligible. Did you tune the car for the offroad pipe? If the a/f ratio is off it will throw things outta wack.