The baseline dyno shows 384.9 wheel horsepower at 4709 rpm. With just the Stage I tune this increases to 469.8 horsepower at the wheels at the same rpm. Torque increases by just over 100 lb-ft at the wheels at the same rpm. The torque gain lower in the rpm range is even higher.
With the addition of downpipes and a Stage II tune gains at 5376 rpm are 102.7 horsepower at the wheels. What bout torque down low? 648 lb-ft at the wheels at 3829 rpm compared to the stock 469.9 lb-ft. That is almost a difference of 200 lb-ft.
Now, these graphs show Dynojet estimate horsepower. What Dynamometer OE Tuning is using here is not known but they used pump gas. Hopefully they will be able to provide further details on the dyno but the M278 is showing significant gains with tuning and bolt ons.
Baseline vs. Stage I CLS550:
Baseline vs. Stage II CLS500 with catless downpipes: