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It comes from the rubber intake duct. The BAC MUST take air in through the AFM or the engine will not idle (it will be un-metered air). If you take it from after the throttle plates, it is not functioning as a BAC (bypass air control) which is supposed to bypass the throttle plates and allow air into the engine.
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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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