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      06-02-2011, 02:21 PM   #22
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Drives: 2015 MW M3/2011 E90 M3
Join Date: Jun 2007
Location: Bay Area, CA

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Originally Posted by TrackRat View Post
A round tube without a radius entry is technically a sharp edge orifice and will always flow less than a properly radiused entry. Look at any modern auto air cleaner assembly and it has a radiused entry for that exact reason.

Again, nit picking here, but the M3's intake tube does NOT have a radiused entry.

(of course, the velocity stacks inside the manifold do!)
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