2007 R171 Mercedes-Benz SLK55 AMG with the Kleemann supercharger for the M113 V8 and Evotech Motorsport USA tuning puts down 421 wheel horsepower at Dyno Comp
A nice result here for a supercharged R171 generation SLK 55 AMG. The car features a Kleemann supercharger, Dyno-Comp upgraded injectors, Evotech Motorsport Tuning (although Dyno-Comp claims it is their ECU upgrade/tune for some reason), and MBH headers. On 91 octane pump gas the result is 421.9 wheel horsepower on the Dyno-Comp Dyno Dynamics dyno. This is good for an increase of 148 wheel horsepower over the baseline.
This dyno is not reading very far off from a dynojet as baselines for the R171 SLK55 AMG have shown horsepower in the 280-290 rear wheel range. So, this car would likely show just a bit more on a dynojet dyno but nothing radically different. Still, horsepower in the 420 wheel range is a very nice increase from rear wheel horsepower in the 270-290 wheel range.
Great work by all involved, dyno graph below.