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If you are NA and don't rev past your ignition capabilities or run lean, you might be ok. If you rev past 6,000 rpm, install a turbo or run lean of 15:1, you can forget it (I have seen headers white hot before).
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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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