I have a question...
I'm gonna get a new wheel with 18inch
should i get 18in 8.5 width and 245/35
or go with a stock size?

also what is the maximum size for B7S4?

 

im not as familiar with the b6/b7 frame... but i know you can fit 18x8.5 on the b5 frame with 245 tire pretty much no problem...and the b6/b7 is bigger. SO... i would say its safe to say youre alright...and could prob go bigger a bit... Pretty sure that frame can fit 19's no issue and maybe a 9 or 9.5 width. But im not positive

 

stay with 8.5 wide.. but you can go up to 19x8.5 in the front.. as for the back.. you can go 19x9.5