in need of some help here, i have been hearing many different opinions from people on this so see what your guys input is.
I am thinking of a exhaust system for my audi a4.... I was thinking to de-cat it, with a full through 2.5" pipe without back boxes aswell?
People have been telling me this will affect back pressure, and being a diesel i will loose torque? So i need some input before i proceed with anything.
Thanks look forward to hearing from you guys