Ford Repair: Supercharged Mustang needs exhaust, high performance catalytic converters, performance catalytic converters

Question
I need help choosing a quality header-to-tailpipe exhaust system for my '02 Mustang GT.  It currently has a Vortech supercharger (at 8 psi), stock exhaust with stock cats and pipes, and Flowmaster mufflers.  I now want a quieter system, but one with good flow characteristics.  Where do I turn for ultra high performance catalytic converters and less exhaust noise?  On a dyno the engine recently showed 353 rear wheel horsepower.  Other mods include a Diablo superchip, K&N air filter, larger fuel pump and injectors, a stronger clutch and 3.73 gears.  

Answer
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  Well...the noise factor will be determined by the choice of mufflers.  For the H or X pipe, I like the Bassanni X-pipes, but you'll have to pay for the quality.  Really any H or X pipe should work just fine.  MAC also makes some more affordable quality H-pipes.  As for the cats, I would look at (again) the new Bassanni metallic substrate converters.  They use a metal mesh instead of a traditional ceramic catalyst and the dyno numbers I've seen on them so far have been pretty impressive.  The mufflers are really a matter of preference.  Borla makes some exceptional and rather quiet mufflers (until you really jump on the throttle), but again they're pretty expensive at around $100 or so each.  I know Steeda also used to make a super quiet muffler that really only came alive when you stood on the loud pedal.  I'm not sure if they still make them, but it's worth checking.  Hope this helps.

Steve