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Old 09-27-2012, 10:35 PM
Xerxes Xerxes is offline
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Location: Tacoma Wa
 
Join Date: Nov 2010
Posts: 24
Mein Auto: 81 323i and 93 525i
I hadn't heard of it, the last few years I've been working on 4x4's and nobody had mentioned this particular modification. It seems similar to "rifling" your intake ports or the intake valves that have spiral ridges on the back. This may have the advantage of not slowing intake velocity to achieve better mixing in the combustion chamber.
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