I've got a Pypes X system on my Bonneville with Dynomax Super Turbo mufflers. It's actually a little too quiet for my taste, even on the Bonnie. If I were doing the system again I'd leave off the X pipe on this car, since maximum performance isn't the goal. That might give it just a bit more attitude on the sound as well.
If your system is in good shape you could just swap out the mufflers. Any turbo style muffler will be quieter than the Flowmasters. The Summit brand turbo mufflers have a decent tone at a good price. My brother has a pair on his '69 Cat.
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1966 GTO
1969 Lemans Convertible- F.A.S.T. legal family cruiser. 12.59 on G70-14 Polyglas tires. 1.78 60'
1969 Bonneville Safari- cross country family cruiser. .
1979 Trans Am 400, 4-speed, 4 wheel disc.
View from the drivers seat racing down Atco Raceway- http://www.youtube.com/watch?v=GhYDMdOEC7A
Ride along in the other lane- http://www.youtube.com/watch?v=mIzgpLtF_uw
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