my second question is brakes. The stock brake's were good but they really couldn't handle the stress of the way i drive

so then if i do the brakes ill have to get bigger rim's because the se rims that are on it are to small. so would an 18 be good or would a 20 be good? i dont want it to pull all over the road and i want my pathfinder to charge the grape vine with ease like it always has.
thanks for any help