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      02-05-2017, 09:01 PM   #1
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335is Mufflers

Has anyone ever cut open the 335is mufflers? I have seen pics of the performance exhaust (PE) mufflers cut open. So, you can compare the difference between stock & PE mufflers.

However, I wonder if we can compare all 3 being stock, 335is, & PE....
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      02-06-2017, 09:41 AM   #2
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Quote:
Originally Posted by mweisdorfer View Post
Has anyone ever cut open the 335is mufflers? I have seen pics of the performance exhaust (PE) mufflers cut open. So, you can compare the difference between stock & PE mufflers.

However, I wonder if we can compare all 3 being stock, 335is, & PE....
You've probably already done your research, but the "consensus" on this thread is that BMW PE exhaust and 335is exhaust are the same, but the PE exhaust removes the butterfly valve whereas 335is exhaust retains it. This is why the PE exhaust sounds a bit angrier on low RPMs, but the same can be achieved with the 335is exhaust by unplugging the actuator controlling that valve or doing the "golf tee" mod

http://www.e90post.com/forums/showthread.php?t=410669
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      02-06-2017, 12:44 PM   #3
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It would be nice if someone actually confirmed this. Been wanting to know this for years. We all know the physical exterior differences that impact noise (flapper, exhaust tips). But if someone cut one open, that would clarify 100%
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      02-06-2017, 01:04 PM   #4
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Quote:
Originally Posted by ayyy View Post
You've probably already done your research, but the "consensus" on this thread is that BMW PE exhaust and 335is exhaust are the same, but the PE exhaust removes the butterfly valve whereas 335is exhaust retains it. This is why the PE exhaust sounds a bit angrier on low RPMs, but the same can be achieved with the 335is exhaust by unplugging the actuator controlling that valve or doing the "golf tee" mod

http://www.e90post.com/forums/showthread.php?t=410669
The amount of packing material in the iS exhaust is still more than the PE has, they are technically different exhausts. However when all 3 exhausts (335i, iS, and PE) weigh the same amount and visually look the same outside, you can concur they are all the same minus the amount of packing material internally and the actuator valve either being present or missing....oh and the tips but w/e on that one haha
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      02-06-2017, 01:15 PM   #5
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Quote:
Originally Posted by nitehawk View Post
It would be nice if someone actually confirmed this. Been wanting to know this for years. We all know the physical exterior differences that impact noise (flapper, exhaust tips). But if someone cut one open, that would clarify 100%
The only thing I would want to know too is if someone put a video of a 335is with the flap disabled on YouTube. You could then compare them, as long as both videos had quality audio.

It makes sense that BMW would just take the PE mufflers and just put a flap in one of them for the 335is, in order to save in cost vs making an entirely new muffler from the inside
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      02-06-2017, 07:10 PM   #6
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Quote:
Originally Posted by Black n54is View Post
Quote:
Originally Posted by ayyy View Post
You've probably already done your research, but the "consensus" on this thread is that BMW PE exhaust and 335is exhaust are the same, but the PE exhaust removes the butterfly valve whereas 335is exhaust retains it. This is why the PE exhaust sounds a bit angrier on low RPMs, but the same can be achieved with the 335is exhaust by unplugging the actuator controlling that valve or doing the "golf tee" mod

http://www.e90post.com/forums/showthread.php?t=410669
The amount of packing material in the iS exhaust is still more than the PE has, they are technically different exhausts. However when all 3 exhausts (335i, iS, and PE) weigh the same amount and visually look the same outside, you can concur they are all the same minus the amount of packing material internally and the actuator valve either being present or missing....oh and the tips but w/e on that one haha
If you look closely at the PE mufflers the performance tag is put on with rivets. I wonder if you took the metal tag off if the brand of Boysen would be present. It's sort of like like buying m3 control arms and the m badge is ground off.
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      02-06-2017, 08:34 PM   #7
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Quote:
Originally Posted by mweisdorfer View Post
Quote:
Originally Posted by Black n54is View Post
Quote:
Originally Posted by ayyy View Post
You've probably already done your research, but the "consensus" on this thread is that BMW PE exhaust and 335is exhaust are the same, but the PE exhaust removes the butterfly valve whereas 335is exhaust retains it. This is why the PE exhaust sounds a bit angrier on low RPMs, but the same can be achieved with the 335is exhaust by unplugging the actuator controlling that valve or doing the "golf tee" mod

http://www.e90post.com/forums/showthread.php?t=410669
The amount of packing material in the iS exhaust is still more than the PE has, they are technically different exhausts. However when all 3 exhausts (335i, iS, and PE) weigh the same amount and visually look the same outside, you can concur they are all the same minus the amount of packing material internally and the actuator valve either being present or missing....oh and the tips but w/e on that one haha
If you look closely at the PE mufflers the performance tag is put on with rivets. I wonder if you took the metal tag off if the brand of Boysen would be present. It's sort of like like buying m3 control arms and the m badge is ground off.
Boysen branding is still present on the PE just on the opposite side of the riveted tag.
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      02-07-2017, 01:43 PM   #8
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My 335is does seem a bit raspier to the PE, which has a deeper sound IMO. I thought I read somewhere that they have different packing also?
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      02-07-2017, 04:40 PM   #9
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Here's a couple clips that showcase the exhaust note of stock IS exhausts.
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      02-07-2017, 07:23 PM   #10
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Quote:
Originally Posted by f30driver22 View Post
My 335is does seem a bit raspier to the PE, which has a deeper sound IMO. I thought I read somewhere that they have different packing also?
The PE exhaust has a deeper sound because it doesn't have a flap built in.

Different or amount of insulation in the IS muffler vs the PE mufflers is purely conjecture right now unless someone can produce a picture of an IS muffler that has been cut open.

There is a pic of a PE muffler that has been cut open on the net.
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      02-08-2017, 04:51 AM   #11
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Surprisingly the P.E exhaust in my country has the exhaust valve, but it's still slightly louder than the IS exhaust I have. And yes has that slightly deeper rasp.
But I like the black tips of the IS
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      02-08-2017, 06:58 AM   #12
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Quote:
Originally Posted by saddart View Post
Surprisingly the P.E exhaust in my country has the exhaust valve, but it's still slightly louder than the IS exhaust I have. And yes has that slightly deeper rasp.
But I like the black tips of the IS
Your country probably has some sort of noise ordinance.

Burger Motor Sports sells slide on chrome black exhaust tips.

Just FYI.
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      02-08-2017, 05:11 PM   #13
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Quote:
Originally Posted by saddart View Post
Surprisingly the P.E exhaust in my country has the exhaust valve, but it's still slightly louder than the IS exhaust I have. And yes has that slightly deeper rasp.
But I like the black tips of the IS
You have a iS in Singapore?! That's curious...Shit I'll have to hit you up then next time I'm out there so I don't miss my car too much
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