what type and size headers? No reason to go big on the pipes if your running small headers ( shortly type ). If you're running sorties, keep the 2.5, if you have long tubes then I would go 3", don't really think you need bigger. Are far as muffler, the chambered ones flow well. single out or duel out is personal preference. On my 93 I run a spintech (single out) and it's cut even with the lower valiance. It's quiter them the flowmaster. At idle the car is fairly quite but deep in tone, at WOT it's pretty loud.
If you plan on racing at E-town the flowmasters may not pass the noise restrictions. I ran a Flowmaster 40 Series on my 84Z (355 with headers) loved it around town, and hated it on the highway! On the highway the drone in the car was so bad I thought my ears were going to bleed! So I don't recomemend flowmaster race series mufflers if you are going to do allot of highway driving, look at the 50 or 60 series if you do want flowmaster. If you looking for a deeper tone without noise look at Spintech or Hooker mufflers they are good mufflers and lower cost then others.
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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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