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It would certainly help, but you will need to readjust your speedometer if you change the rear gear. Or you can run a larger tire to offset the difference.
i swich the rearend in my 1500 and i dont think that it change the speedo. but if it is because it is big jump then i understand.
what would happen if i pull off the cat and the other thing that i cant spell
It would get louder, and be illegal according to our government rules (which nobody gives a damn about anyway, lol). What other thing are you referring to?