I also have 18" wheels on my '03 MP5. TSW Rib 18' x 7" 45 offset / Falken 215/35/18 tires. The car is not lowered and I have no problem with rubbing even with 5 passengers. If you have a 7" with 45 offset is fine on a 7.5" with you need a 48 offset. I think the best thing and cheapest way to go is to roll your fenders. Any body shop can do it for you. Many of the show cars I have seen have rolled fenders.

-Baddog

 

Well, i called the wheel manufacturer... and they said that i shouldn't shave the wheel down... So my only other alternative is to sell the wheel... or roll the fenders! But i wonder if i roll the fenders, if it would scrub if i lowered the car? decisions, decisions!