600HP is a realistic goal. The C11 made 1200HP during qualifying!! The US M119 has a 10:1 compression ratio. I don't know if euro spec is higher, it may be? Anyway, running 1 bar or 14.5psi with 10:1 is pushing it. I wouldn't suggest pushing it any higher than that with the stock compression ratio.

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320