I had the Proflash programmer, and it allowed for 44 inch tires. So unless you are putting on a huge lift kit, these programmer can handle your larger tires. I have 37 inch tires and the programmer was able to reprogram my speedo no problem. You also get the added benefit of increase performance and better fuel ecomony.
03 H2 Sunset Orange Polished Magna Charger w headers & cold air intake, 37" MTRs w Weld Mountain Crushers, GPS Nav. & 2 rear LCD TVs w DVD, Extreme Tube steps
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03 H2 Sunset Orange Magna Charger w headers & cold air intake, 4\" Rancho lift, XTC Light Bars Front & Rear, 4.56 gears with Eaton Front Locker
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