FWIW I remember an engineer from Ford saying that 18" wheels are perfect performance-wise for the s197 when asked why the GT500KR downsized from the 20" on the prototype (the same ones that are on the Super Snake) but I'll agree 20" is the way to go if looks are your only concern. I've loved my 18's since I got the car and think they'll be perfect once I get the car sitting nicer with a mild drop and some meaty rubber once the BFG's are shot.
On that note, if you're considering lowering yours, there are a lot more factors that come into play on this platform. Typically guys have been getting away with bare minimum of springs, camber bolts to get the alignment back into spec and an adjustable panhard bar to re-center the rear. Chances are your stock shocks won't take long to go afterward either and good aftermarket ones are recommended to help bring the ride back from being unbearably rough.
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