The accordian looking piece has to serve some purpose, if it didn't, I am sure bmw would of not put it on the car. Dinan kept that piece on there item so it has to serve some purpose. With all these issues, rubbing against the hood and gaps around the charge pipe, paying a hefty price and now getting these issues, doesn't make sense to spend the money to get problems. I just read and saw the full intake with the plenum looses power as well without a proper tune....we all want more power but it seems more of a headache than anything to make it fit and finish just like OEM or even somewhere close.
The only three companies that I seen that actually read and people's dyon and comments says as they describe is Dinan, Eisenmann and Arkapovic.