Quote:
Originally Posted by holt
no complaints with my MS filter. Not sure about other filters but I get a really nice throaty sound when accelerating between 3k and 4k rpm. A nice bonus.
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Much appreciated - we install about 3-4 Macht Schnell filters a week here in house, it's a great first upgrade for M3s with proven power gains on the dyno.
Quote:
Originally Posted by major_kusanagi
MS/AFE/APE filters don't have the plastic reinforcement structure you see inside the stock filter. I am wondering if the BMC filter is more rigid.
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The afe filters use a very soft polyurethane lid that will compress with just a slight amount of pressure, distorting the bottom seal and possibly letting in unfiltered air (this is the "fluttering" sound people are reporting).