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E30 M3 questions

Anybody try the "cam gear" modification?  Supposedly this gear changes the
exhaust timing?  I'm curious as to whether or not you can feel the 
hp gains in the mid rpm range....

Also... anybody know where I can get brake ducts cheap?  Dinan wants like
$300.00.  They smoke pot too.  I burned up my brakes pretty good last
year at drivers schools.  Also, can someone tell me why in the world BMW
sold that car without them?  For crying out loud they're on the 325is!

jp