There is a theory that you can upgrade the diaphragm (the part that rips!) with a superior one scavenged from a BMW AOS.
It would be a great diy to replace the cheapo OEM diaphragm with a piece of Viton or similar/better?
http://www.amazon.com/Fluoroelastomer-Durometer-Smooth-Finish-Backing/dp/B00CCGYGEG