I’d say it was a good move. Regardless of the adequacy of the stock brakes, if you don’t have 100% confidence in them when they are pushed hard (I never did on any of my GS’s), then it is worth the work. Even if yours aren’t right in some way, fixing the stock ones, or going for a much better option, is a no brainier IMO. Especially as we all know, the sliding calipers are commonly “problematic” on most lexus models. Unfortunately, I’ve no idea how easily they fit, but it sounds like it has been done before, and the other lexus models that have those calipers as stock, run 17’s as an option. Sent from my iPhone using Tapatalk Pro