I haven't heard anyone claim that they found out 'why' they fail. They are located in an area that does not get heat soaked, so it's probably NOT heat. They are mounted in rubber with the mounting bracket isolated with rubber mounts too... so probably NOT vibration.

Being a Bosch part, I'm surprised it does fail, unless it's because of the heat of the intercooler coolant itself.

The Johnson CM30 pump has proven it's worth on the track for the MB guys on their fourms.

Johnson makes marine pumps, so you know they have to be reliable. I couldn't believe how much smaller it was though... so thin.

As to making it plug-and-play... you would need the other end of the MB plug that is part of the stock pump. I do not know where to get it. My solution keeps you from having to cut the factory harness and would have to be forced apart, just like any other automotive plug system as I had to use pliers to push in the new 'pins'.

Hope that helps.