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What essentially happened there is you lost a crap ton of boost pressure since the exhaust was not contained within the turbine housing, so the turbo never spooled up to it's operating RPM. Nice catch, tbh I don't think I would have had the patience to catch that one. Just got my 220d yesterday and so far I'm freaking loving it. It is really hard to notice that you only have 175hp when that turbo kicks in.