The Ford Triton 5.4 4-valve supercharged of engines!
350/4 = 350+87.5 = 437.5 kW = 587 horsepower (!!!)
I don't agree with that number, though. I selected 4 gears because the 5th one is overdrive. However, the whole powertrain is a tank. It sometimes feels more like a 10-speed than a 5-speed. I would say the 5.5K engine in the E55, CLS55, and prototype SL55 make as much as 515 horsepower catted and 530 horsepower decatted.
The production SL55 (including the early version), along with the CL55 and S55 are more powerful because of the exhaust intake with as much as 550 horsepower catted and 565 horsepower decatted.