He killed it with the adjustable cam gear and not running pistons with fly cut reliefs machined into them. One night of running it at 340rwhp - boom, no more valve train. To be honest the turbo manifold was nasty too. Those Sigmas never came with injected turbo engines from factory and I'd almost be wondering if it actually was a G63B 2.0 as a lot of 1.8 Cordia turbo engines were used for transplants. One model of Sigma did come with a unique 4G52 draw through turbo that really hauled ass from factory.

*I just logged back on to S-G.com for the first time in years. Apparently the original site is so broken that most of the archives and posts are missing. I still have admin privileges