Hi i just bought a 04 6mt coupe and i was wondering whats the widdest wheel you could put in the rear without any modifications???preferrably 18s, and what would the offset have to be??

 

do it right with 19s! 18s are way too small. unless you have a reason, like tracking or something...otherwise...19s ftw

with a 9.5/10.5 wheels, imo, the best offsets are the low 20s and high teens.

anyway, the size wheel you get without having to roll/shave the fenders depends on if your lowered or not, if you plan on a camber kit or not, what size tires you plan on getting, offsets, etc.