You'll also need an additional PCM file: $EE for the '94-'95 LT1/L99 $DA3 for the '93 LT1 F-Body or $DA2 for the '92-'93 Y-Body (Corvette), which will cost you an additional $19.95 from TunerCat. It is a great program, also known as Computer Automotive Tuning Systems (C.A.T.S.), which allows the above things to be done, all for only $69.95. TunerCat is your first step, the program I recommend to read your current PCM image, change its contents, and then reupload it to your PCM. There are three basic items necessary to tuning your own LT1 (or other GM) PCM: After payment, the 20+ page printable PDF of these free online tips will be emailed to you.
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