According to the dealer guys... the worst thing you could do to your 3.0 is putting one of those heavy ass 4.6is wheels.

Even 18" wheels you got(if you have SP) is heavy enough alredy. Get some lighter racing wheels for better performance. You could get somthing like 19" Hamman HM2s for $3000 w/tire now days. Hartge classic looks great too. But, 22" is little too extream for my taste...