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Anything that changes the ratio of RPM vs. distance moved forward will require a PCM setting change or the speedo will be off. This includes going from 18" rears to 19" or changing rear diff ratios.
John.
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2001 Z06 QS/Blk, Borla Stingers, Longtube Headers, Vararam Ram Air, Short Shifter, HPTuners, Wideband Commander, GTech, Lingenfelter Mini-Tub, 18x12 rears, BFG 345/30/18 DR's. [no more mods for a while...oh God, someone please stop me, I'm seriously considering a supercharger...]
Best Run = ET 12.126, MPH 113.9, 60' 1.775, DA 1465
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