Update: Just purchased a low mile oem E55 H/E I found on MBworld Forum ($90. shipped). They just had a group buy on the EC H/E so there are several oem's that I'm sure could be had If any one wants to go this way. I wish I could have afforded the new Eurocharged version, but this will do. When I eventually add the water/meth, that will be all the cooling I need for my purposes. In removing my stock exchanger; dang, what a bug fest going on down there.