I called and spoke to someone at Renntech two weeks ago about getting their pulley/pcm package.
They do have a package for the SRT-6 and its only $3,000 vs $3,500 for the SLK 32.
I am not sure what the difference is, or if there is a difference, I forgot to ask.
They have you ship your pcm to them next day air, they do the program, then ship it back with the pulleys next day air...so the car is only down for 3 days or so.
I was leaving for vacation...so I opted to wait until I got back before going through with it.
I think I'm going to call them tomorrow and get more details and before shipping off my pcm...
So far I have Magnecor wires and IK16 plugs sitting on my work bench, K&N filters on the way, and Renntech pulleys/pcm coming soon... I can't wait!