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<blockquote data-quote="DiNAN.328i" data-source="post: 159635" data-attributes="member: 2662"><p>"At idle and engine speeds up to 2500rpm, the flap is held closed (vacuum applied to the actuator). This allows exhaust gasses to flow through the open pipe only, reducing low frequency noise which maybe generated.</p><p> </p><p>Above 2500rpm, the exhaust flaps is open (no vacuum applied to the actuator) which allows exhaust gasses to flow through the short pipe for maximum performace in the mid to high rpm range."</p></blockquote><p></p>
[QUOTE="DiNAN.328i, post: 159635, member: 2662"] "At idle and engine speeds up to 2500rpm, the flap is held closed (vacuum applied to the actuator). This allows exhaust gasses to flow through the open pipe only, reducing low frequency noise which maybe generated. Above 2500rpm, the exhaust flaps is open (no vacuum applied to the actuator) which allows exhaust gasses to flow through the short pipe for maximum performace in the mid to high rpm range." [/QUOTE]
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