This is well explained and clear enough for even an old guy to understand the theory. Just hope I can fine those sized pieces here in Canada!
BMW Z3 A better air intake by Mike Fishwick
I have a feeling that the original design of the Z3 air intake system was dictated more by the space available, rather than engineering considerations. For example, the air filter is smaller than even that of the 8-valve Volkswagen Golf GTI, which is known to be obstructive on even a 1.8 litre engine. In 16-valve form the Golf filter is enlarged to almost double the size of that used on the 2.8 or 3 litre Z3 and the 3.2 litre M Roadster.
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