The arch liners have to go, not the wheels!  

I'm going to get squeeze some 225/40s on the back and I may get some 3mm spacers to give the filler neck a bit more breathing space, but I think I can brace the neck to sit further in.  The 8.5 fronts will get some 215/40s  

Don't worry, I won't be running it like this daily, just when the shows are on.  I like the comfort level you get with the 17s.