Maddog, I'll be sure to do that. However I found a big crack in the exhaust manifold on the pipe connected to the first cylinder, could this cause the problem I described ?? Part of the exhaust gases excape through the crack without spining the turbo i which case at high rpm the turbo can't supply enough air ??

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190E 3.0-24v (M104 980) turbo @ 0.8 bar
1/4 mile: 2.483 / 13.540 / 175.17 km/h (street tires)