I am trying to decide which aftermarket exhaust to go for and the one I am quiet interested in is the Rear exit header (the one sold through ford racing without cat and muffler). Two questions: 1. Is it necessary to modify programming (CPU) to accomodate the change in the exhaust system (i.e. any negative effects if changing the exhaust without changing the CPU)? 2. Has anyone installed this system and is the noise tolerable at low RPM? Lastly, where can I get it? I have been trying to contact Dallas Mustang without any reply.
thanks
thanks