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Generating pressure from the pump. I tried it with limited success (used a plate with a very small hole in it what the line bolts to the cat). The pump is not always intelligent about when it pumps air into the exhaust. I had to do something to the ACV as well (I don't remember what it was - too long ago).
I did get it to work pretty well in the end, but I had to put a helper spring on the actuator in order to get it to open at 3500 rpm.
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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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