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I installed the BMS DCI on my 135i manual. I didnt really notice any extra power but I did notice slightly better throttle response.
I then removed them not long ago. The interesting thing was I preferred the stock intake. Just seemed smoother. I prefer the engine noise too rather then the sucking noise.
In hot weather/conditions it has been dyno proven that the stock air box gives MORE CONSISTENT HP readings. IE it actually gives more power since it isnt as affected by the heat. In cold conditions the DCI are better.
The DCI reduce the work the turbos have to do to spool, but I think the effect is neglibile WITHOUT a tune.
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