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I have a few Race cars and GT1 certainly taught me about different stages of Tuning where I didn't know existed, for example, The amount of Lock put on a Limited Slip Differential and the many Stages of NA/Tunes and Turbo's, And lets not forget the BigBrake Kits and the prices of the upgrades! Anyone else beside me know how they wanna upgrade there personal car or learnt something about Upgrading because of the GT series? Mainly GT1 because that's where it started.