Cams for ml series are cheap, I wonder if they have a different grind on them compared to our crossfire.
http://www.oempartsdirect.com/

I ordered an intake and exhaust valve, just to have for specs and curiosity. The ML320 piston is about $250 each, I would like to get a stock 3.2 piston for comparison. I think I'll try and source an entire ML320 engine before I commit to buying one piston. Damn they also want $100 for one ML320 injector. I’m gonna have to do some calling around. Can't wait for my neighbor to get his injector flow test machine up and running, then we can find out if there are any differences in injectors.