Our non-R threw a shoe last night so it's time for new tires now. Used Nitto Invo on our GT and the handling was super but sizes are not right for the non-R If I spec the R with 305/30 19 and 315/30 19 they are available. Or, I can spend more $ and go back with the factory Michelins. The car does have lowering springs but I wonder if the R specs will fit as I think the R uses wider wheels. Anyone tried this - or have a better idea? Thanks!!