I'd look at Bolra race mufflers, but instead of side exits run turndowns and point them in slightly towards each other as opposed to pointing down or out, this will act to cross~cancel the exhaust pulse and help quite the car down a bit. This normally works better then having the exhaust out the back or side where the noise sensors are located.
Fred ran this setup on his 94 and had no issues at E-town.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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