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      02-16-2015, 11:14 AM   #1
CedarZ4
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Replacing Exhaust Tips; What is this on the muffler?

I finally decided to replace the exhaust tips with Cybas. However, due to the length of the tips, it would require cutting the stock tips all the way up to the muffler. This is ok for the left muffler as it is just a tip. However, on the right, there is more going on. I know on the left side of the right muffler attached to the tip is the butterfly valve (which I'll remove with the tip), but what is on the right (circled) that comes off of the muffler itself? For those who have replaced their tips, how did you work around this?





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      02-16-2015, 03:16 PM   #2
VailM3
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Not a good idea at all thats the bypass pipe when your RPM get over 4k (i believe) it opens up. Cutting that would be bad news.
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      02-17-2015, 10:04 AM   #3
CedarZ4
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Does the butterfly valve control the bypass pipe? Why would a bypass pipe be necessary; I thought the whole muffler was closed at low RPMs?

For those who have replaced their tips only, please chime in on how you made it work. Having looked through various BMW threads prior to deciding on doing the switch, it appears that only the E89 has this "bypass pipe"
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      02-17-2015, 04:32 PM   #4
bigendbob
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Looks like an earth strap for the o2 sensors further up back the exhaust system.
So does the valve open above 4k, in which case if it's closed the exhaust has to go somewhere, one assumes the smaller pipe.
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      02-17-2015, 06:57 PM   #5
rking117
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that is definitely a bypass pipe
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