Exhaust porting makes it louder, but the turbo should quiet it down a little.
Are you running an aftermarket lightweight flywheel? If so you will need to restore fuel at 2000 rpm or so to keep it from stalling (it drops off too fast).
I really doubt that the dashpot is the issue.
When are you going Haltech? 
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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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