If your going to kit up the car and going for show, chuck some 19's on it, ive seen some R34's around having 18's with full kit and sometimes it looks too small like the cars rolling on 17inch or something..all depends on which kit i guess...but 19's will give the bodykit some good clearance from the ground..
20's is just too crazy..
but if you want to take the car to track and do all the goodies, 18's the way to go.
maybe some Works?
think these are 19's
GT-C's look good tho, think you got the same kit as this one Julz?