i'm running 245/40 18's on and 18x8 wheel...but they have the same bolt pattern as jaguar s-types which will make it rather difficult and troublesome to get wheels that fit AND look good without having to pay waaaayy too much...if you have the $$$ go HRE, beautiful and amazing wheels there...but i went with the VERDE kaos...never heard of the brand name before, but they looked decent and i was tired of looking...but now that they are on there i'm glad i made that choice...ZENETTI makes some wheels that will fit that dont look bad...are you going to drop it?...i dont suggest 20's at all because they make it look funny like a hot wheels car or something...18's you dont notice any difference in ride quality even with the Eibach springs, but you will scape and bottom out as soon as you get them before you realize how low you are, you still arent that low, but speed bumps dont like me and steep driveways hate my exhaust...i've bottomed out once and my gf bottomed out once and that was the last time she drove it...