I custom fabbed an exhaust once, it was LOUD. I ended up replacing the headers and front section with racing beat headers and presilencer and leaving the catback alone.
Basically, if you actually intend to drive this car on the street, you should either use very thick tubing and several mufflers/presilencers, or go with a pre-made exhaust.
I like racing beat because they are relatively quiet (except for the stock exhaust, which is insanely quiet).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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