12-05-2008, 09:43 PM | #1 |
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3.5i exhaust pipes
I have noticed that from one of the exhaust pipes there is hardly no smoke coming out and it does not get hot. The other one gets normal amount of smoke out and gets warm (drivers side).
Is this normal?. Is one of them fake, or only works under certain conditions? Thanks. |
12-07-2008, 07:59 AM | #3 |
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The reason is that there is a vacuum flap on the right-hand tail pipe which is electronically closed below 2500 RPM to better control exhaust gas flow and noise. This forces all the exhaust gas through the left-hand tail pipe until the revs rise and the valve opens. A pretty common BMW feature.
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12-07-2008, 12:37 PM | #4 | |
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12-07-2008, 03:24 PM | #5 | |
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30d, 35d and 35i exhaust system: Attachment 174192 50i exhaust system: Attachment 174193
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12-07-2008, 05:12 PM | #6 | |
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Cheers, Anteater |
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12-07-2008, 07:39 PM | #7 |
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Maybe someone at the factory forget to remove the paperwork from inside the exhaust pipe. Just kidding! LOL
http://www.bmwusfactory.com/uploaded...anu17_high.jpg |
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12-08-2008, 12:04 PM | #8 | |
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I think I must have clicked on 35d (twice in a row) instead of 35i when I was comparing the different exhaust systems. So to sum this up: 30d - No Exhaust Flap on either Driver or Passenger side 35d - No Exhaust Flap on either Driver or Passenger side 35i - Passenger side DOES have an Exhaust Flap, Driver side does NOT 50i - Passenger side AND Driver side have Exhaust Flaps on the inner most pipes the outer ones do NOT (50i has two exhaust pipes her exhaust tip finisher/tail pipe) Again, thanks Anteater for pointing this out!
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