Nice meetin u Steve, i was the one borrowing ure lighter lol.
I've been tryin to do some research at work (car park attendant) checkin out all the cars rubber.
Porsche turbo use 18x8 an 18x11! Thats 225 front and 295 rear! But then again thats rear engine.
BMW M3 Uses 18x8 18x9, 225's and Stretched 255's
Most performance rear wheel drive seem to be usin 225 front and 255+ rears. Definetly go 8 front and 9 rear. Taking into account that 255's on an 8" would be pushing it and u'd have a bulge in the tyre wall.
Cheers,
Lozz