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I have a 2015 M235i manual, low mileage at 42k miles. Been having progressive worse on off throttle delay especially in comfort mode, better but still evident in sport. It feels like a boost leak. I know what a boost leak feels like from my R21T and 335i days. I've had the charge pipe replaced with Forge, a smoke test done and I've replaced all plugs and coils. I get no codes. When i do a throttle reset the thing has loads more power but still a lag and soon goes back to same behaviour. I get a whistle from left side of the car (opposite to turbo) on part throttle and goes away on WOT but can hear air on intake - perhaps charge pipe resonance or air filter box.
Does this sound like a DV issue? My mind is saying could be carbon build up or injectors also.
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