Dean!
I did not realize that we had chatted before until I visited your website to check your mods. You may recall that I emailed you late last Fall in re finding an original Alpine CD Player, mounting bracket and the Rug cover.
According to the Manufacturers site:
http://www.oz-racing.de./liste-Dateien/sheet016.htm
They are recommending 255/40R17 to a max 265/40R17 on their 10X17 with a non-spacer offset of 19MM.
Your site states you are running 275s on your rears. Italianbenz says he has been experiencing scrapping on his 275X18s.
Have you experienced any scrapping with the 275s on your car?
Tom
OBTW, I like the "built-in look" of your GPS. I usually know where I am going and it would probably be just another expensive toy that would get little use but then again the whole damn car sort of falls into that category!^) Would you mind telling us what that GPS set-up set you back?