I have an OEM euro airbox intake for sale from my e90. This includes a K&N filter already installed, the original filter, and the euro MAF. Please note you will need to remove this and use your US spec MAF in its place (very easy, just unscrew and screw in).
This is a really nice upgrade for any N52 engine including the 328 and 330. Bought new from ECS tuning and then purchased the K&N filter separately to maximize performance. This has been a great combination, and after a lot of research with other pricey options, this was the best quality and value since it is an OEM part.
It definitely sounded better than stock esp in the upper RPM's, plus it had a little performance gain on the ol' butt dyno. I would not sell this but I am selling the car. Asking $350 shipped within the continental US.
Will post pictures later or upon request.
Located in Irvine for anyone local.