I did see a post here a few weeks ago that stated that most tunes use the SLK 32 AMG map, and that can cause a problem with a Crossfire since the SLK injectors are higher capacity. I couldn't find that thread, but I did find this post by HDDP:

Thanks, I know those guys... Good group of people... I like using Doug at http://www.lindertech.com I have had great experiences with him... And you can't beat his resume'... He already has my injectors and is going to flow test them on Monday. That's what sparked his call... He opened the box and said these are not the standard injectors from the 112 engine, they are lower flow...

The point behind my previous post was that DCX has installed lower flow injectors into the Crossfire than the normal MB 112 engine... This is probably to increase fuel mileage numbers... Which obviously hurts HP... There is an 11 lb difference between our injectors and the injectors that were spec'd for the 112 engine...