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If you leave the stock ECU in and don't change the fueling, your cats will probably be ok until January. My issue was that I was running 16:1 AFR while cruising.
I could meet emissions with my standalone, but I couldn't afford the 10 mpg penalty that I would take to do so.
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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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