This is what I'm after right now... since the Cougar is now my winter car / daily driver and the Mustang is... the Mustang. Basically, the Cougar is not fast enough to justify making undue noise, so it's getting downgraded in the exhaust dept.

So far I've found that with MSDS headers and stock everything... the car is dead quiet inside with a faint rasp audible outside the car. With MSDS headers, o/r Y-pipe and stock cat-back... it's drone-free inside with a faint V8-ish growl, but outside it has a pathetic tin-can rasp. It feels considerably faster with the O/R Y, but I'd like to clean the sound up and maybe even free up some power by replacing the stock rear muffler. I'm actually considering a blowmaster of some kind, but I'm still not sure... I love the quietness and interior sound of the stock catback, but I'd like to improve the look and sound of it. I don't know if a flowmaster at the very end would make it drone with the stock res. in place.

2003 Mustang GT 5-Speed, FMS 4.10 gears, Dr. Gas O/R X-pipe, Flowmaster cat-back, BBK CAI, C&L intake plenum, Accufab 75mm TB, Steeda Timing Adjuster - 13.70@102.23 (SOLD) 2000 Cougar V6 ATX with many mods - 15.93@86.97