[metal nut]

I know this is most prob a silly question but are there any air vents in the boot on a E90, if yes where are they located?

[grussauto]

Vents from the cabin or vents to the outside?

[Efthreeoh]

I've not directly verified it with the E90 chassis, but every BMW I've had has air vents in the flanks of the rear fenders where the rear bumper wraps around the bottom of the fender. Looking on realOEM shows body panel parts with cutout for the vents and the pic below shows part 4. I'd assume the E90 is built this way. The vents are there to equalize cabin pressure when the car is at speed.

[JamesM3M5]

^^ Yes, what he said ^^