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      06-30-2014, 01:05 PM   #1
Dackelone
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Arrow F80 M3 / F82 M4 exhaust resonator delete and straight pipes

So a friend of mine took delivery of his brand new M4 last week. He did not have it but a few days before the mod'ing has begun!

He had a friend, he goes by the name: New Fiftyninefifty on FB: cut open the factory resonators and welded in, a straight pipe - bypassing the factory resonator - but maintaining a factory "look"! It's a pretty stealth look.

IF anyone lives in Germany and wants to have this relatively cheap mod done... just send me a PM and I will get you in touch with the welder(Nurnberg area) guru.

The car's exhaust flaps are also controlled via a switch in the drivers cockpit. Now you can have the exhaust flaps bypass the muffler when NOT in Sport or Sport+ modes.


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videos after mid pipe delete... keep in mind the exhaust has zero miles on it and will surely change tone(deeper) once the exhaust carbons up some more...

Flaps open vs. flaps closed...


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      06-30-2014, 02:34 PM   #2
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How does it sound inside the cabin ? Does the active sound make it really loud inside ? Sounds
Great btw a bit louder which is nice
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      06-30-2014, 03:17 PM   #3
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Yo'd better delete the cats from the mid pipes.
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      06-30-2014, 03:57 PM   #4
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Quote:
Originally Posted by jc1654M4 View Post
How does it sound inside the cabin ? Does the active sound make it really loud inside ? Sounds
Great btw a bit louder which is nice
I added a new video. The owner really likes the sound inside and out!
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      06-30-2014, 04:00 PM   #5
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Quote:
Do the resonators contain the flaps?
No the resonators do not have any flaps. The flaps are at the rear of the muffler. They are controlled electrically. But now the owner has wired in a special switch to activate those flaps when he chooses.


totally stock car with only switching the flaps on and off...
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      06-30-2014, 04:23 PM   #6
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Interesting!

There is a crossover pipe inside that resonator though isn't there?
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      06-30-2014, 07:07 PM   #7
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Sounds great. Why no crossover pipe though?
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      07-01-2014, 07:26 AM   #8
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Quote:
Originally Posted by jackkk View Post
Yo'd better delete the cats from the mid pipes.
agreed - this not the resonators in my experience
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      07-01-2014, 07:31 AM   #9
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Quote:
Originally Posted by BMWJ View Post
agreed - this not the resonators in my experience
I changed the mid cats for the resonators and it also looked steath but the pipe was more straight and it was no resonation sound. I liked it. But deleting the resonator it seems strange for me. No power gane but more beer can sound.
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      07-01-2014, 09:28 AM   #10
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Quote:
Originally Posted by jackkk View Post
I changed the mid cats for the resonators and it also looked steath but the pipe was more straight and it was no resonation sound. I liked it. But deleting the resonator it seems strange for me. No power gane but more beer can sound.
yes resonators = good
cats = bad
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      07-01-2014, 12:37 PM   #11
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Any more info on this switch? I honestly was quite happy with the sound of the car stock. I'd probably just leave it on Sport+ (the sound anyway) and call it a day.
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      07-01-2014, 03:01 PM   #12
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Quote:
Originally Posted by W/// View Post
Any more info on this switch? I honestly was quite happy with the sound of the car stock. I'd probably just leave it on Sport+ (the sound anyway) and call it a day.
The switch just breaks the ground contact for the two exhaust valves in the end muffler. Its relatively easy to install. This was you can have the deep loud bark of the exhaust(like when in Sport or Sport+) but also when you want to drive in comfort mode(or any other modes).
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      07-01-2014, 04:31 PM   #13
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Here is another friend's N55 135i that New Fiftyninefifty did a muffler delete(ala M3 style). He cut open the factory muffler and bypassed the perforated internal exhaust pipes. It sounds AWESOME!



Here is the exhaust mod on an e9x N54 335i...
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      07-01-2014, 04:35 PM   #14
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Quote:
Originally Posted by Dackelone View Post
The switch just breaks the ground contact for the two exhaust valves in the end muffler. Its relatively easy to install. This was you can have the deep loud bark of the exhaust(like when in Sport or Sport+) but also when you want to drive in comfort mode(or any other modes).
I would like to see some kind of easy to install adapter that goes between exhaust flap housing and valve cable connectors to make it always keep exhaust flap open.
I guess this would be pretty simple to make and mass produce.
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      07-01-2014, 04:52 PM   #15
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@dackelone thanks for the addition in this thread. Thats my 135i in the video. I can vouch for the quality of newfiftyninefifty #inkedexhaust. He does amazing work. If your interested in this mod do it.
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      07-01-2014, 06:05 PM   #16
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Quote:
Originally Posted by Dackelone View Post
The switch just breaks the ground contact for the two exhaust valves in the end muffler. Its relatively easy to install. This was you can have the deep loud bark of the exhaust(like when in Sport or Sport+) but also when you want to drive in comfort mode(or any other modes).
Do they default open at idle? What's the stock behavior? (I could crawl under the car and look I guess
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      07-02-2014, 03:28 AM   #17
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Why no x-pipe instead of simply replacing the perforated tubes? You can open the top and install x-pipe for even better sound over these tubes. Still maintaining same stealth appearence from below!
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      07-02-2014, 07:24 PM   #18
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Quote:
Originally Posted by Dackelone View Post
The switch just breaks the ground contact for the two exhaust valves in the end muffler. Its relatively easy to install. This was you can have the deep loud bark of the exhaust(like when in Sport or Sport+) but also when you want to drive in comfort mode(or any other modes).
Im confused - I thought unplugging the valves would mean they stay closed. But you are saying breaking the ground opens the valves??
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      07-02-2014, 07:45 PM   #19
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Quote:
Originally Posted by W Cole View Post
Im confused - I thought unplugging the valves would mean they stay closed. But you are saying breaking the ground opens the valves??
That is my understanding(I think he even says it in my short video). I will double check and ask my buddy with this S.O. M4.
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      07-02-2014, 07:51 PM   #20
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I have unplugged it under the car and it completely closes the valves.
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      07-02-2014, 08:10 PM   #21
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To each his own, but it sounds too raspy. If anything this car needs a mod that makes the exhaust tone deeper and throatier. This mod IMO just made it sound worse.
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      07-02-2014, 09:44 PM   #22
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Quote:
Originally Posted by Dackelone
Here is another friend's N55 135i that New Fiftyninefifty did a muffler delete(ala M3 style). He cut open the factory muffler and bypassed the perforated internal exhaust pipes. It sounds AWESOME!



Here is the exhaust mod on an e9x N54 335i...
Attachment 1052146
Attachment 1052157
Why does that 135i with exhaust mod sound better then an M4 with Akrapovic!?! :
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