I did make it over to CJs shop last month. Nice place and it seems like they know what they are doing. I have no problem with them using my car for prototyping. However I don't want to pay for a set when they are done. Especially if power gains if any are unknown. We left it as he was going to try to find a SLK 32 to prototype as well at the same time to make sure both headers are the same. I am fairly confident the OEM manifolds are the same but clearance issue on a new header design may be an problem between our cars and the SLK.