I would make a heat shield if I was you..
1. It will really help keep the dust from the fan out of the filter
2. does a lot to keep the fan from blowing radiated heat and air into
the filter as well
3. JUST DO IT! - like the NIKE commercials... heh
no, but I would try and find some Aluminum sheets at say, Home Depot, down the Concrete/Roofing materials Isle, (don't know why I know that), and try and form your curves as smooth as possible, while cutting your angles with tin snips. The aluminum is easy to bend, just don't screw it up by going to fast, and after you cut the surroundings to fit the form, you should get some rubber moldings to cover the sharp edges and to seal the shield...
do you understand the directions? or do you need more help?
ps-it's definitely worth putting up a shield..
FOUNDER of the BMW-Forums Michigan Club
<span style='color:green'><a href='http://www.cardomain.com/memberpage/458339' target='_blank'> Car Domain UNFINISHED </a> </span>
<img src='http://www.bmw-forums.com/forum/uploads/post-4-1078289877.jpg' border='0' alt='user posted image' />