Has anyont out there had their stock mufflers removed and replaced with the dynomax bullet race mufflers? I just thought this was something to consider before dropping $600-$700 on an exhaust system that might net a very little gain in the torque department. I believe in cost effective enhancements and not just doing something because of popularity. I am not in any way knocking the many exhaust setups that I have read about, but rather inquiring before I drop tall money on an exhaust system.