there are a few radiators you can drop in that will do MUCH better than stock, though the stock NX radiator is a pretty good one. There is a Modine unit and a couple KOYO units. Koyo makes the huge all aluminum race radiator and a more replacement sized radiator. Modine makes a radiator that is copper/brass and is thicker than the NX radiator. It is like $160, where the Koyo will be a lot more (like $350). Here is a page with Koy0 and CSF radiators
http://www.absoluteradiator.com/Prod....asp?idProd=27 the modine is like the bottom one on that page, just a tad thicker. Modine can be bought from Carlos Faxas through the forums here. I think his name is 93 blackbird.
Brent