Quote:
Originally Posted by wpoll
No E53 X5 with the M57TU ever had swirl flaps, as far as I can tell. Vendors selling conversion kits insist that they did but they are wrong....
In some cases, the same M57TU engine in the X3 E83 did have swirl flaps fitted... weird... 
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M57N engines with DPF (EU4) have swirl flaps. I've removed the flaps on mine.