Can I assume you are asking about the G56 air filter? Order from G56, they are responsive folks and do business happily.

I went with the AR Stage 1 for warranty reasons and I can honestly tell you that it made such a big difference that smoking the rear tire is something I have to try NOT to do. And to top it off the engine runs MUCH MORE SMOOTHLY.

[Linked Image]

Oddly enough the surface area of the mesh of the filter is smaller than the MMC filter but it works much better and I believe it is the stinger that is provided with the cover that protrudes into the venturi of the EFI.

2019 M3W Sold and is now in Las Vegas enjoying the showgirls :-)