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Either of you have vibration or alignment problems? I just traded an 02 Mustang GT for an 03 G430. The Mustang came with really low profile 17s and sorely needed an 1" or so of lowering. Evidently the after market caster/camber plates allowed enough adjustment that never heard any lowered Mustangs having problems contrary to this board where you read of quite a number of vibe/alignment problems that give folks fits.
I have the stock chrome 17s and like them ok - but will wait until I need tires and get a package so wife won't notice.
Alot of the vibration that Lexus owners (especially GS'ers) feel is just the suspension hardware aging. There have been quite a few posts here with owner that have had their lower end serviced (bushings, control arms yadda) and reported great success
i have a stagger 20x10 and 20x8.5 and i love the feel yes you will hear more road noise due to smaller side wall but the wider wheels and small side wall will improve cornering and you'll have less wheel gap but after i lower my car damm what a different.. so bigger is better for me