Thankfully they have sorted the airbox out in the 335d and the new 330d.
It is now a simple box at the front of the engine bay that is opened by 4 spring clips. You could change the filter in about a minute.
I remember putting a K&N into my E46 330cd and it took ages.
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Last: 330cd Sport - Silver Grey, 335d M Sport Coupe, F10 535d M Sport.
Current: AW F21 M135i, Coral Red, Pro Nav, Vis, HK, & Clunky Adaptive Suspension
Current: F15 X5 XDrive 40d M Sport - Space Grey, lots of toys.
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