275/40/18's are DEFINITELY too tall. You should look into 285/35 or 30/18's in the front and something more like a 305+/30/18 in the rear with that much power and torque. A staggered set-up like aceinhole's would be better than a non staggered set up with all that torque. Of course a set-up like that eliminates the option to use cheap wheels like rotas, and more than that probably requires the use of custom ones like ace's ccw classics.
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