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is there a way to control the valves wiht the Akra system?
or is it left up to the OEM settings?
as i see akra do a sound kit for some models but not the M5 system. is that because its vacuum controlled and not electronic?
can anyone explain the differecne between the vacuum and electis systems of valve control?
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2014 M5
1990 E30 318i Touring
1999 E38 728i -sold
M235i - sold
Activehybrid 5 - sold
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