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I had RB headers feeding through a straight pipe to dual Dynaflow mufflers and with a stock port, it wasn't loud at all.
With the streetported 4-port, I had to add a presilencer.
If the headers are really thin, you will get a loud exhaust, thick headers are your friend.
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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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