I've seen several low boost dyno sheets for the m112 NA. you have to dig deep on the MBZ forums, check under clk320, and the German mbz forums, it's a b!tch cause you need a translator, but it's all out there..

there was a guy on ebay who sold his slk320 with a low boost conversion, he said it's a much more enjoyable car, so he went ahead and had them slide in the low compression pistons. He spent over $10k, but it was mostly laybor cost of a one off project car.

I believe Kleeman will e-mail you one of the lowboost dynos, but I prefer the forum for real world info without the sales pitch