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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 03-13-2013, 08:10 PM
PittX52011 PittX52011 is offline
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Better sound from a stock 550 exhaust

Guys I want to get better sound from a stock 550 exhaust. What are my options. Thanks
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  #2  
Old 03-13-2013, 08:50 PM
HDEddie1 HDEddie1 is offline
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Depends...

If you want to retain the stock 550i mufflers, then unfortunately, there is not much. The stock mufflers are robust (2.75 inlet, twin 2.25 outlet) but they're designed to be VERY, VERY quiet.

Not sure your definition of "better" sound, but most guys change out the rear mufflers and notice louder right away. I did BMW M6 retrofits and found them very aggressive and a bit too loud. There are also many aftermarket "straight through" systems at all price points.

"Better"? Depends on what you're after. The best sounding ones that I've heard is a retrofit of the factory F10 M5 system. That's what I'm planning on
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  #3  
Old 03-13-2013, 08:57 PM
PittX52011 PittX52011 is offline
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Thanks for the reply. I'm not looking for M5 sound, but somewhat in between. I like the square mufflers of 550 that's why I did not want to change them. I was thinking if there is something that can make them little loud.
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  #4  
Old 03-13-2013, 08:58 PM
PittX52011 PittX52011 is offline
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And what's a straight through system. Sorry for the ignorance.
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  #5  
Old 03-13-2013, 09:07 PM
HDEddie1 HDEddie1 is offline
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"Louder"

Basically, a straight through muffler is where the pipe enters the muffler shell and exits the other side without making any turns or encountering additional sound baffles or chambers. They are typically aftermarket mufflers and (much) louder, and also lower restriction. Stock mufflers (as seen on almost all factory cars) are almost always reverse flow (turns, baffles, cambers) and much quieter but also more restrictive to gas flow.
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Originally Posted by PittX52011 View Post
And what's a straight through system. Sorry for the ignorance.
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  #6  
Old 03-13-2013, 09:21 PM
HDEddie1 HDEddie1 is offline
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Another route to get deeper and louder sound consider while retaining stock rear mufflers:
1) remove the secondary mufflers (aft of the engine down pipes);
2) remove the resonators (before the axle);
3) change over all factory bent piping to 3” mandrel bent piping.

The first two changes are cheap to do and reversable. The last change is relatively expensive $1000+ and requires a talented muffler shop.

The sound from any or all these changes are subjective to each person as to if it is “better” or just louder. Look for someone in your town that has done them or (though not as accurate) check out some sound clips on forums like this. Your milage may vary...
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Originally Posted by PittX52011 View Post
Thanks for the reply. I'm not looking for M5 sound, but somewhat in between. I like the square mufflers of 550 that's why I did not want to change them. I was thinking if there is something that can make them little loud.
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  #7  
Old 03-14-2013, 06:07 AM
Silververtu Silververtu is offline
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http://www.6post.com/forums/showpost...63&postcount=1

I've done this mod on the stock exhaust over the weekend. Now it's a little bit louder and deeper. This is probably the easiest and simpliest way to get better stock exhaust sound without any drone
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  #8  
Old 03-14-2013, 07:37 AM
LFTW8SNOW LFTW8SNOW is offline
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Quote:
Originally Posted by Silververtu View Post
http://www.6post.com/forums/showpost...63&postcount=1

I've done this mod on the stock exhaust over the weekend. Now it's a little bit louder and deeper. This is probably the easiest and simpliest way to get better stock exhaust sound without any drone
Will the zip tie melt due to heat?
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  #9  
Old 03-14-2013, 08:11 AM
P-TownM3 P-TownM3 is offline
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Quote:
Originally Posted by LFTW8SNOW View Post
Will the zip tie melt due to heat?
One would think.
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  #10  
Old 03-14-2013, 08:21 AM
HDEddie1 HDEddie1 is offline
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I've done this mod as well. Real easy and no cost. Yes, it is slightly louder (maybe 10%) and no, the cable tie does not melt. The lever on the flap that the cable tie attaches doesn't get very hot.
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  #11  
Old 03-14-2013, 08:52 AM
Silververtu Silververtu is offline
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Quote:
Originally Posted by LFTW8SNOW View Post
Will the zip tie melt due to heat?
I used thick paper clips instead of zip ties
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  #12  
Old 03-16-2013, 06:10 AM
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K-A K-A is offline
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I'm assuming that "open flaps" mod isn't able to be done on a 535i (due to assuming it having no flaps)?
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  #13  
Old 03-16-2013, 01:46 PM
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BigDeep1 BigDeep1 is online now
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Quote:
Originally Posted by K-A View Post
I'm assuming that "open flaps" mod isn't able to be done on a 535i (due to assuming it having no flaps)?
Correct
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  #14  
Old 03-16-2013, 06:30 PM
Boardman Boardman is offline
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Any downsides/potential issues with keeping the exhaust open full time?
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  #15  
Old 03-16-2013, 06:35 PM
supershaft supershaft is offline
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I had the zipties method installed over the past few days and the zipties will not melt. They don't actually touch any of the piping. You get a nicer sound <2500rpm but that's it.
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  #16  
Old 03-16-2013, 06:59 PM
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Quote:
Originally Posted by supershaft View Post
I had the zipties method installed over the past few days and the zipties will not melt. They don't actually touch any of the piping. You get a nicer sound <2500rpm but that's it.

Probably all I need. Will try it tomorrow.

Thanks!
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  #17  
Old 03-17-2013, 02:30 AM
demas demas is offline
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wonder if you could keep them open with software coding?
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  #18  
Old 03-17-2013, 04:20 AM
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Quote:
Originally Posted by BigDeep1 View Post
Correct
Grr. I'd love to get some extra slight no cost sound sans drone.
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  #19  
Old 03-17-2013, 08:15 AM
supershaft supershaft is offline
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Quote:
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wonder if you could keep them open with software coding?
They are vacuum controlled so no.
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  #20  
Old 03-17-2013, 09:01 AM
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In my E60 535, I got into the trunk and bypassed a solenoid that controlled the vacuum pressure (vacuum pressure opened the gate).

I wonder if the same thing could be done on the F10 to avoid using ties.
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  #21  
Old 03-17-2013, 02:14 PM
ifnd323 ifnd323 is offline
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What's the purpose of the gates?
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  #22  
Old 03-17-2013, 03:54 PM
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Surely not to hold down the awful racket this thing makes! Probably has to do with maintaining back pressure or some such.
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Last edited by Donm; 03-18-2013 at 03:49 AM.
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  #23  
Old 03-17-2013, 04:42 PM
supershaft supershaft is offline
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More to do with the sound than backpressure. This has been discussed extensively on forums. Turbos don't need backpressure.
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  #24  
Old 03-17-2013, 04:44 PM
supershaft supershaft is offline
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Quote:
Originally Posted by cordoor View Post
In my E60 535, I got into the trunk and bypassed a solenoid that controlled the vacuum pressure (vacuum pressure opened the gate).

I wonder if the same thing could be done on the F10 to avoid using ties.
The lines aren't in the trunk but you can do the same thing by crimping the line under the car. Zip ties wont leave any evidence behind.
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  #25  
Old 03-17-2013, 05:03 PM
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Quote:
Originally Posted by supershaft View Post
More to do with the sound than backpressure. This has been discussed extensively on forums. Turbos don't need backpressure.
Makes perfect sense, the turbos are restrictive enough to keep exhaust system pressure in check.

Thanks for the insight!
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