Jason's Mercedes-Benz C63 AMG W204 came to Revhigh after a major engine refresh and some performance upgrades. Powered by the legendary M156 6.3L V8, the car had received reconditioned cylinder heads, updated head bolts, extractors and a set of performance camshafts. However, after having the car tuned elsewhere, Jason wasn't completely happy with how it was performing. Starting With a Dyno Test We put the C63 on the dyno to establish exactly where the car was at. The initial