Welcome and nice looking 4.8! As far as tires, if you got the OE wheels that belong to a 4.4i, I think the alternate size is 255/60/18. The taller sidewall will allow just that extra bit of tread. I just don't know how far you can take it on stock wheels without getting into spacers and all that fancy stuff. So I am assuming since you mentioned island it is all smooth pavement right?!? Haha. Umm there was someone on here that took their X to the shore and redid their wheel configuration and worked pretty well, but their name is escaping me at the moment. Try doing a search, in the meanwhile I am sure the Experts will chime in shortly!

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2011 E70 50i M Sport