I was convinced to go 20/21, usually an upgrade feels right at +1", and I have seen images of 20/21 setups and on my screen it looks great. Was a done deal, BUT spoke to someone from this forum, who saw a 20/21 setup and said it does not look right on the car, rims just look too big, sidewall too thin out back with a 21". I guess I would have to see it in person to be able to judge, but I think my vote would still be for 20/21 over staying stock diameter (maybe slightly wider out back) on nicer rims. Perhaps someone here can post aftermarket 19/20 and 20/21 side by side to have better judgement ?