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e36 328 twin tailpipe
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<blockquote data-quote="mrhartge" data-source="post: 95191" data-attributes="member: 31"><p>I heard 2 theories. </p><p></p><p>1. it's there to keep exhaust noise down when idling / moving slowly (below 3000 RPM) </p><p></p><p>2. It's a engine performance feature that changes the exhaust pipe length i.e. flap close means short length for increased torque low down, open means short length for increased BHP higher up the rev range. It increases back pressure at low revs by being closed and slowing gas flow this helps low down torque. Then its opens at high revs to help speed gas flow through the exhaust to help hp.</p><p></p><p>But hey, I could be wrong…</p></blockquote><p></p>
[QUOTE="mrhartge, post: 95191, member: 31"] I heard 2 theories. 1. it's there to keep exhaust noise down when idling / moving slowly (below 3000 RPM) 2. It's a engine performance feature that changes the exhaust pipe length i.e. flap close means short length for increased torque low down, open means short length for increased BHP higher up the rev range. It increases back pressure at low revs by being closed and slowing gas flow this helps low down torque. Then its opens at high revs to help speed gas flow through the exhaust to help hp. But hey, I could be wrong… [/QUOTE]
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