I took my 2000 F-150 supercab w/ the 4.2L V-6 to have dual exhaust put on this morning. The guy who did the work has done many jobs for me before and he said for the best sound that I needed to remove the muffler instead of replacing it, and he was right. However, I'm concerned that it will have more adverse affects beside that loss in low-end torque. PLEASE E-mail me back w/ your ideas and opinions...THANX!!!