A friend of mine put it on his S4 and it seemed to work fine. Only negative I could see was that he had to put anywhere from 1 to 4 extra oz. of wheel weight to get a balance. Another system is Intellitire from Lear Corp. It is a valve stem/sensor combo that adds very little weight because it doesn't need a heavy mounting system. Its secured like a bolt-in-valve stem and has double-sided tape that sticks it to the rim. I saw the system at SEMA a couple of years back and saw a few ads for it in Car and Driver etc., but can't seem to find any current info about it.