Official Straight Pipe/Muffler Delete Fact Thread. - BMW M5 Forum and M6 Forums

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Old 11th October 2010, 17:57   #1
timmay77
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Official Straight Pipe/Muffler Delete Fact Thread.

I thought I would just start a thread to answer any and all questions about the straight pipes/muffler delete mod.

Muffler delete - to remove the 4 OEM mufflers and replace them with a section of pipe, then use exhaust tips to finish it off. Some people choose to remove the stock resonator and some choose to leave it intact.

REMOVING THE STOCK RESONATOR WILL CREATE A DRONE. Let me say this again, if you remove the stock resonator, the car will be VERY loud and will drone at lower RPM's.

LEAVING THE RESONATOR IN THE SYSTEM WILL KEEP THE SYSTEM TAME EVEN WITH THE MUFFLERS REMOVED. If you remove the mufflers, but leave the stock resonators in place will open up the exhaust to have a very throaty, V8 power sound without being annoying at cruising speeds.

Straight Pipes - a lot people use this term, even myself, when referring to the muffler delete mod. As Diny pointed out in another thread, a true "straight pipe" system, it would have straight pipes from the headers back removing the cats, resonators, and mufflers.


Here are a few pictures of some muffler deleted cars.




1.



2.


3.




4.You can see in this picture the stock resonator box is still intact sitting IN FRONT of the differential.



5. A very good example of before and after.








6.Here you can see the stock set up with the stock resonator.









Here are a few videos of the car WITH THE RESONATORS STILL INSTALLED. (Thank you JCM55555)



+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


Casual driving:
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


Hard pull (up-hill):
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


3rd and 4th WOT:
+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.





Here are some videos with the RESONATORS REMOVED...... (Thank you M55555)

First Rev = 2.5K RPM
Second Rev = 4.0K RPM
Third Rev = blip to 3.0K RPM

[watch in HD for best quality]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.




Normal driving from 0 to 60mph, shifting around 3.5k rpm, then cruising at 60mph. Windows down.

[watch in HD for best quality]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.



2nd gear pull, windows down, DSC on

[watch in HD for best quality]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.




First half of video is normal driving with windows UP.

Second half (when you hear the blinkers) is WOT with windows DOWN.

[watch in HD for best quality]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.




Cruising at 60 MPH, windows down

[watch in HD for best quality]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.





Warm engine idle

[you know how to watch it ]

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.






50-60 MPH cruise with windows UP, 6th gear

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.





Straight pipes from resonator.

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.






Here are some videos I made with my resonators STILL ON and my mufflers removed.....

+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


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Last edited by timmay77; 12th October 2010 at 06:10.
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Old 11th October 2010, 18:16   #2
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Thanks Tim.

Nobody should have any reservations about doing this modification (muffler delete) because you will most certainly be pleased with the sound and; if you're not the process is easily reversed.
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Old 11th October 2010, 18:22   #3
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would definitely go this route if i didnt have a set of eisenmann race already!
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Old 11th October 2010, 19:06   #4
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So the question is...do they drone?!??! Cause I don't want drone!!111one

Hahah just kidding. Thanks for the thread! Hope this question never gets asked again.

Interestingly enough, I've been having trouble finding shops in the DC area who will perform a muffler delete. A Midas tried to tell me that it's illegal under EPA rules(riiiight), another one flat out refused. Both referred me to various custom exhaust shops. Funny but I don't see this as a true custom exhaust job. But whatever. I need to source tips and then get this done. Can't wait!
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Old 11th October 2010, 19:15   #5
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Now I got to find me some affordable tips. What magnaflow tips are you guys using?
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Old 11th October 2010, 20:30   #6
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It's about time this gets added with the influx of straight pipe questions as of late. Thanks Timmay!

Permission to link to this thread to every "straight pipe" thread going forward.

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Old 11th October 2010, 20:52   #7
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Quote:
Originally Posted by mister2d View Post
Now I got to find me some affordable tips. What magnaflow tips are you guys using?

Just about all if not all of those pix and video's are using Timmay's custom tips.

Check out this post for more details:

http://www.m5board.com/vbulletin/sal...pipe-tips.html
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Old 12th October 2010, 02:47   #8
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Quote:
Originally Posted by Hdhntr23 View Post
Just about all if not all of those pix and video's are using Timmay's custom tips.

Check out this post for more details:

http://www.m5board.com/vbulletin/sal...pipe-tips.html
I thought Timmay wasn't making them anymore which is why I asked.
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Old 12th October 2010, 04:43   #9
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Quote:
Originally Posted by mister2d View Post
I thought Timmay wasn't making them anymore which is why I asked.
He quit for a bit due to some pressure at work. He's started back up again but cant make them as fast as he was. If you have patience he can get to you and make you a set as well.

If I didnt get such a screamin deal and love the sound of my Dinan's so much, I would have a set too.
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Old 12th October 2010, 05:50   #10
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That first post should go on Wikipedia.
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