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theres a reason no1 has answered you do some searches and thers a million and one ways to change your et, the fact that u drive a 3rd gen fd wit 300hp doesn't tell us much.
if its your first time at the track, and thats 300rwp, i would expect low 13's if you are a half way decent driver. If you are really good and have decent tires, maybe a 12 second slip