AMR Performance is pushing the Mercedes M276 DELA 30 twin turbo 3.0 liter V6 harder than any other tuner. You may remember their revised Stage I tune pushing a C450 (same M276 DELA30 engine as the C43) to 12.3 @ 112 in the 1/4 mile.

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They also got 371 wheel horsepower out of the car. This is a crank output graph:

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Almost 90 horsepower over stock.

We have the wheel output figures, crank figures, 1/4 mile time, and now a 0-60 test.

An owner was able to use GPS to time 0-60 in 3.8 seconds. That certainly makes a tuned C450 or C43 a Mercedes value performance proposition.