There is a 280SEC in Charleston SC with a "BLOWN" & nitrous injected 6.3 that makes around 550 HP. The owner said he spent over 1500 hours in the project.
I saw the car at a MB race event at Talladega Ala. WOW!!

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
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44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
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