I am feeling much better about the electronic aspect of this conversion. I called three different credible companies this morning and they all said the same thing. It is nice to finally get some consistant answers.

As mentioned much earlier in this thread my local mechanic told me about a Company called Beckmann Technologies. Beckmann works with independent mechanics that have customers that need a new ECU but can't afford a new one. Beckmann sells re-conditioned used ECU that have been unlocked so that they can be programed to the customers car. Unlocking wipes the ECU clean of any codes that associated it to the previous car, such as VIN, key and cluster codes.

I spoke to Bob Beckmann and he can unlock my donor CL500 ECU for $250 It then needs to be programed in the car with a Mercedes Star Diagnostic system to adapt the ECU to the car. After the car is started about three time the ECU will lock in the new information including. cluster codes, VIN, and key codes.

To get other opinions, I spoke to the owner of ICS performance who is also a Kleeman dealer. He told me the same thing and that I needed to use Beckmann to first unlock the ECU and then the Star diagnostic programing.

He gave me a contact at Kleeman USA to call and they also told me the exact same thing and that they had dealt with Beckmann technologies many times in the past and that I need to listen to Bob Beckmann.

BTW, I mentioned to Kleeman that Brabus has done this and isn't talking. I also mentioned that stage two of my project would be a supercharger. As soon as I mentioned supercharger they couldn't have been more helpful.

So for now I am sending the ECU to Bob Beckmann since other credible sources are all telling me this is how it is done.