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      12-06-2013, 09:33 PM   #18
Racer20
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Drives: F80 M3, 228i THP, E46 ZHP
Join Date: May 2009
Location: Ann Arbor, MI

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Talking to a colleague, I learned that the E9X M3 uses a Sachs EDC system where the variable valve is actually internal to the piston rod. I'm not very familiar with exactly how it works, but I've heard good things about that system.