Mail order is likely the best you will do. I'm sure you don't want to spend the money but another option is to convert to another PCM (0411 LS1, Holley). Plenty of folks around to tune those systems.
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97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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