does the 2.5" pipes cause to much backpressure and low end torque?? im not making any mods on my car. thanks
I have Mac 2.5 ehaust on my stang and it does fine. Not a hint of problems other then the "drone zone". I'm not sure what your asking, but if your going up in pipe size compared to the 2" stock i guess you have, then you will have less backpressure in your pipes