Here's my 2 cents..... I have the same M2 18" rims and running 33" Nitto Terra Grapplers. My rig has a 4" lift and I'm not happy with the look, definately going bigger in a few months.
With some coil spacers and torsion bar keys I'm going with the same set up this guy did, he has a 4" lift and 18" rims too. 40's baby !!!
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