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I couldn't see going too much larger on the exhaust on a non-turbo making much difference. You would lose exhaust velocity, and that might drop torque accordingly.
For a turbo, I don't know if you would get too much more out of it; if you managed to get another 2-3 psi out of the turbo, I...
I think it would suit just fine. The Curt 14082 model hitch is a direct bolt-on (you'll have to drill the frame for bolting, but it's the proper width), and it has a 12,000 lbs rating. If you're going to run electric brakes, you'd need a way to wire in 12 volts, so figure a DC-DC converter of...