I was wondering what's the widest wheel and tire combo on a 18 inch rim will fit on a stock fd without having to modify the body

 

18x10 +50 or +52 from Kinesis, with a 285/30/18 is perfect from what i've read here. All four corners.

 

You might need smaller diameter springs (adjustable coil-overs) to run that in front -- I'm not 100% sure, but you should investigate that before buying wheels in that size. You can run 9.5" wide wheels in front with the stock springs, though.

-Max

 

i have 18*10 with a +45 and they look great

 

18x10 all the way around at +45 and no rubbing?

 

18x9.5 +50 with a 265/35 tire fit my car all around. No rubbing at all.