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A 345/35/18 will fit on those wheels, sure. Keep in mind it is going to be a fairly tall tire, about 28" tall. Not sure how it will fit in the wheelwell, as the stockers are what, 26" tall?
Ideally a 345/30/18 would be just about right. Little less sidewall, just over 26" tall.
Edit: just realized that you WERE asking about wheelwell fitment, not wheel fitment. Doh. I can't say for sure but it's gonna be close. I'd say factors such as your suspension stiffness, ride height, alignment and such are gonna be key, you're probably just gonna have to test it out. Too close to say (unless someone already has installed those monsters)
thanks for the input man. I'd like the 28" tire since I'm trying to run fast on 18"s. My other choice is 335/30/18 Hoosier drag radials if the 28" MTs won't fit. The Hoosiers are only 26" tall. I do want to lower the car though so the Hoosiers are probably the ticket.