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I too have an ecotune dpf and egr bypass with maxitune remap on my 330d mileage 150k, at start up I get a little puff of smoke and then none at all, it may be your turbo oil seals are worn or on the way out, 1st if you still have the original egr fitted it may have defaulted open, try putting a blanking plate/washer into the egr inlet side at the jubilee clip end this will ensure that no exhaust gasses will getting through and cost nothing, also try and get the emissions tested as that will show up on a smoke test.
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