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I've been curious about this topic as well. I bought my '02Z used and it has 18's on the front vs. the stock 17's (same 265X35 series though).
Torque mgmt (I think) kicks in (even in Comp mode) at 6,000 rpm on the 2-3 shift. The rpms just go south. I never get near red line so this is odd.
I have also hit 119 at the top end of 3rd on the highway and then the "shift" indicator comes on in the HUD. Also very odd as I think mathematically I should only be able to hit 112-113 w/ stock gearing.
Would the 18's in the front make a difference?
Pat
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'02 MY Z06-Michellin Pilots, Chrome Z06 Rims, Eradispeed 2-piece Rotors, CAGS, T-body bypass, Hood Seal (Home Depot), BPP Vortex, Airbridge & Tune
'69-Z/28 (dad was original owner) - 10k miles, trailer queen 
'86-Buick GN - 6900 miles - 11SECGN
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