Official Straight Pipe/Muffler Delete Fact Thread. - Page 44 - BMW M5 Forum and M6 Forums

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Old 5th February 2012, 00:51   #431
bobbyorr
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finally got a little video lol

next time i'll get an acceleration and fly by for sure

e39 m5 straight pipes, no resonator or mufflers! - YouTube
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Old 10th February 2012, 18:47   #432
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+ YouTube Video
ERROR: If you can see this, then YouTube is down or you don't have Flash installed.


Thanks to timmay!
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Old 10th February 2012, 19:13   #433
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I'll chime in with my opinion that this does lead to some minor droning around 2000-2200 RPM... which translates to 70mph in 6th gear on the freeway. It's not a bad drone, but definitely noticeable if you hang around that RPM range (which I now avoid). I'll probably put the stock cans back on soon.
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Old 24th February 2012, 21:43   #434
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Thanks to everyone for posting their stories, videos, pictures, etc. I am def. doing this in the next week or two.

I am having an issue with the following though:

I see many people paid $200 or less for the labor. Those who paid more seems to have had the jobs done at performance shops vs muffler/welding shops.

I found two performance shops that quoted me $300 and $350. But I am sure I can probably go to a local muffler shop and have it done for half the price.

Any suggestions on if its worth the extra $ to have a performance shop do it vs a muffler shop for a cheaper price? I would of course take reputability into account when picking a place, but if I can get it done for half the price with same/similar results, I would probably do it.
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Old 24th February 2012, 22:17   #435
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Quote:
Originally Posted by Jdog_M5 View Post
Thanks to everyone for posting their stories, videos, pictures, etc. I am def. doing this in the next week or two.

I am having an issue with the following though:

I see many people paid $200 or less for the labor. Those who paid more seems to have had the jobs done at performance shops vs muffler/welding shops.

I found two performance shops that quoted me $300 and $350. But I am sure I can probably go to a local muffler shop and have it done for half the price.

Any suggestions on if its worth the extra $ to have a performance shop do it vs a muffler shop for a cheaper price? I would of course take reputability into account when picking a place, but if I can get it done for half the price with same/similar results, I would probably do it.
Just depends on the bends one shop can make vs. the other. I believe mandrel is the way to go, make sure its not crush bent. correct me if I'm wrong boys..
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Old 25th February 2012, 03:04   #436
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I've seen worse horrors than simple crush bends. Pipes with smaller OD welded inside a larger pipe, hangers welded to seat belt bolts, etc. Try to look at some examples of their work. You could also be specific, "I want mandrel bends butt welded and hangers connecting to stock OEM brackets". You'll find that they suddenly raise their prices when you ask for good work.
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Old 25th February 2012, 04:20   #437
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Mandel bending is pointless for a muffler delete imo.

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Old 25th February 2012, 04:28   #438
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Quote:
Originally Posted by donoman View Post
I'll chime in with my opinion that this does lead to some minor droning around 2000-2200 RPM... which translates to 70mph in 6th gear on the freeway. It's not a bad drone, but definitely noticeable if you hang around that RPM range (which I now avoid). I'll probably put the stock cans back on soon.
Definitely drone around 2000-2200 RPMs. Does anybody know why this is? Does the exhaust tone 'resonate' inside the resonators at this frequency?

This RPM range is generally avoided when driving around in the city for me anyway, but I really didn't consider it on the highway. Hope this doesn't bother me too much...cuz I will admit the drone is fairly annoying when present.

If I didn't love the sound when shifting so darn much I might put stock cans back on.
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Old 25th February 2012, 04:38   #439
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Quote:
Originally Posted by bdsmitty88 View Post
Definitely drone around 2000-2200 RPMs. Does anybody know why this is? Does the exhaust tone 'resonate' inside the resonators at this frequency?

This RPM range is generally avoided when driving around in the city for me anyway, but I really didn't consider it on the highway. Hope this doesn't bother me too much...cuz I will admit the drone is fairly annoying when present.

If I didn't love the sound when shifting so darn much I might put stock cans back on.
I posted videos of my car on the highway. No drone! Not sure why some people are having the issue......
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Old 25th February 2012, 04:59   #440
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Quote:
Originally Posted by VacMan View Post
Mandel bending is pointless for a muffler delete imo.
It's pointless for most street exhausts, but there are two different kinds of crush bends. One will make a convoluted mess out of the inside radius which can reduce cross-section to as little as half the original diameter and does change the exhaust tone a bit. A muffler delete on our cars shouldn't require bends so tight that it crushes the insides anyway.
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