It is beneath the cowl top grille in E(90/91/93)
Series 3 BMW car filter will fit your bike. I use them in my K100RT. Don't buy genuine, after market ones will do. Ride Safe.
The BMW was founded by Franz Joseph Popp. The BMW 3 series was first launched in Leipzig, Germany. The Manufacturer of the BMW 3 series was founded by the German Auto Maker BMW. The first BMW 3 series was manufactured in 1975.
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The 2005 BMW 3-Series has 24 valves.
The 2001 BMW 3-Series has 24 valves.
The 2008 BMW 3-Series has 24 valves.
The 2007 BMW 3-Series has 24 valves.
The 2009 BMW 3-Series has 24 valves.
The 2014 BMW 3-Series has 16 valves.
The 2002 BMW 3-Series has 24 valves.
The 2006 BMW 3-Series has 24 valves.
The 2013 BMW 3-Series has 16 valves.