Looks like a couple of E55 guys have installed a killer chiller on their cars and are reporting great results - Killer Chiller installed and.... - MBWorld.org Forums

"When we first fired it up the IAT's were in the 70's, btw ambient was 72, and after about a few minuted it quickly dropped into the high 50's. Once on the road we immediately logged 45-47 degrees..... We decided next to make a quick blast on the freeway to see how it recovered with no HE, the IAT's went up to 60 ish and recovered to 54 degrees quick. We continued on the freeway for about another 5 miles and IAT's stayed at 55. Once we pulled off the freeway and back to stop and go traffic the IAT's dropped back to high 40's low 50's. On the final test we left the car idling with the hood closed, in the sun, and the air condition running....it stayed at 54 and didn't move over a 5-10 minute period. The results were staggering and we both felt extremely satisfied with the test."