36,800 miles.......Im having the same exact problems. I do believe it is that pump as well because it works just fine when you start the vehicle up and run it after it has been given a chance to fully cool down, but then once it warms up, the acceleration is unbelievably slow. If this is what losing 115 hp feels like, I would NEVER recommend buying a run of the mill Crossfire. I do believe it is a loss of much more than that to be honest because now your intake system is struggling to get the air through the supercharger system, where as the NA Crossfire is designed in a different manner. With that being said, I plan on changing the pump.

To RL, the link you listed...that pump is Plug n Play? I just want to confirm this because I am about to order it. The dealer quoted me 479?!?!? for just the pump...hmmm, I do not have time to perform the repair myself so it has to go to the dealer. But if I can generate the part myself, Id much rather do that than pay what they are telling me. It makes sense to me with Maybach being a Benz product, but I dont like ordering car parts over the internet so I need to confirm this first.

Not trying to hijack this thread, but it only makes sense. It sounds like the same exact issue.