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^Usually as long as it's not too straight or large in diameter you'll have torque gains, 2.5" is good if you wanna keep torque, any larger you'll lose a lil but not much.
I don't need to worry about decibel levels or any of that, I'm not in Cali(thank god for many reasons). Here all the rednecks run way louder exhausts than my 4 cylinder could make on their jacked up trucks and beat down mustangs. :P
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