Ive got all s2 convertion in my mk5 esc cab, and i really want to uprate the intercooler.

I dont want a massive grs, because 1. I dont really want to cut the bumper, although, if i find one i like, i would .... anyway, could i put a cossie one on, direct replacement on the s2, or a rs500 direct replacement, and notice a difference? or is it a case of spending mega money.

Thanks guys