Frank, I'm running an 18x10 5.75" BS stock wells with 275-40-18 tire. The lips on the 1/4's are rolled and trimmed. It's a very tight fit as is, but my car sits quite low.
I have seen a few guys run 285's and 295's but I think you would have to have the back end sitting a bit higher, sprung stiffer and wheel backspacing has to nailed.
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