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Re: question/trivia (archive)
[ Follow Ups ] [ 3-series (E36) Message Board ] [ Msg. Board FAQ ]
Posted by Lokki on June 11, 2000 at 23:54:31:

In Reply to: Re: question/trivia posted by aquilles325 on June 11, 2000 at 22:56:07:

I understand that it also increases back pressure at lower rpms. Higher back pressure tends to improve torque from what I understand, but I'm no expert. At higher rpms, you want more flow so the spring opens..... hopefully an expert can answer this in more detail

: It is called a butterfly valve and is there just too reduce exhaust noise when accelerating from a standstill. It opens up once your up to speed.



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