Zep do make radiators they come in 2row or 3row mate and i believe (dont hold me to this) there all aluminum radiators i believe, never used one but i know toby runs them and they are the daddy when it comes to cooling the 4e down.
Yeah the zep is made out of different material mate, there a hell of alot of money though, i can offer a good all aluminum radiator for alot cheaper buddy which will hold temps down more than enough.
Zep also do a Racing radiator similar to the SARD racing Radiator in terms of performance 3 row. But you are looking in the region of 400 odd pounds for a radiator.