No leaks found. I'm coming to the conclusion that the ignition timing must be optimized (haven't changed it yet) for this setup as it's very different from the one before. Plan is to play a bit with the timing this saturday/sunday and see what happens .

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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)