Ok, maybe not a whole radiator, but a polishing kit that works great!
I bought this kit today,
http://www.harborfreight.com/14-piec...kit-98707.html. It's $19.99 and I used one of the 20% off coupons that are literally everywhere.
I spent about four hours with my drill in the garage polishing my new aluminum radiator I got from Summit a few weeks ago. The results are spectacular. It's hard to tell in the pics but it it's literally a mirror finish on the side tanks now. I paid $200 for the radiator from Summit, it's this one
http://www.summitracing.com/parts/SUM-381325. The Be Cool polished radiators are like $800!!
Another plus for Harbor Freight!