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Might try these folks for the Prom.GM TBI Products :: Parts & Accessories :: Calibration Proms & Mem-Cals - Howell Engine Developments, Inc.

Man. I don't know the cost of any of it,just know thats your cheapest option with out doing engine mods ( SPEED COSTS,HOW FAST YA WANNA GO ?). You'll have to do the leg work yourself,Summit, Jegs or...

I would think the cheapest way to gain some ponies is a cold air intake, good set of headers with 3 inch free flow exhaust. And find a company that can supply you with a custom burnt prom for the...