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When I went from 3:23s to 3:73s the car was completely different. It gained ALOT. My car with the A4 felt alot better, but I dont think with 3:42s and a M6 and bumping to 3:73s will be a big jump. You have alot of transmission gear to go to a 4:10 without really running into drivability problems. I think (IMO) 4:10s in a M6 would be the best way to go if youre looking to gain some performance from the car.
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