I have install 20mm spacer on all wheels, no issue in front, on rear the black circle around fender get rub by the tire after track use, and now no rub anymore on rear. Nothing can be seen from outside. And even when you look in the fender it look stock (not damaged)
I have 20" wheels too.
For information I've install 20mm spacer and front strut bar and that reduce a lot the orignal understeer effect. very good mod in my point of view
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