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Old 9th July 2018, 11:36 AM   #1
R60BBA
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Default E46 M3 Backbox Exhaust Debaffle

I would like to install a non resonated Supersprint X pipe and debaffle the OEM backbox.

Hopefully it would sound something like these:

https://youtu.be/PN5X9-qSpYY

https://youtu.be/QKoG6hFNAi8

https://youtu.be/YfbZe0ATfbs

https://youtu.be/JUwZlWrX6w8

https://youtu.be/3V-yZxifoZ4

Can anyone on here do the work / know somebody who can do the work?

Also, would doing this affect performance (ie loss in low end torque)?

Debaffle pic here:




Last edited by R60BBA; 19th July 2018 at 10:33 PM.
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Old 10th July 2018, 08:57 AM   #2
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Bump...
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Old 11th July 2018, 03:55 PM   #3
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https://youtu.be/YfbZe0ATfbs

This one sounds epic
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Old 11th July 2018, 04:31 PM   #4
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Quote:
Originally Posted by theworkerb View Post
https://youtu.be/YfbZe0ATfbs

This one sounds epic
Yeah it does, mainly because thereís a tuned note in addition to the debaffling. Some of the other debaffled exhausts Iíve heard are loud but donít have much of a note...

The inside of his backbox looks similar to the one attached above.

But finding someone whoís willing to do the work has been problematic.

Nevertheless Iíve booked the car in with StyleDynamics who think they can sort me out.

Fingers crossed
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Old 11th July 2018, 09:01 PM   #5
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Be careful with super sprint non res x Pipe centre, i put one on mine with the standard back box and it made it sound really weird and also made it quieter than with the original centre with the little box !? Luckily had the original to go back on and fine again and louder again
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Old 12th July 2018, 07:39 AM   #6
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Quote:
Originally Posted by beau1990 View Post
Be careful with super sprint non res x Pipe centre
Yeah Iíve heard.

The fabricators at StyleDynamics have recommend that I just debaffle the backbox first before installing the SS non res x pipe.

Then if itís not what I want I can always get it installed afterwards.
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Old 12th July 2018, 10:58 AM   #7
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Will you be changing the tips?
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Old 13th July 2018, 11:09 AM   #8
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Quote:
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Will you be changing the tips?
No I want to keep the OEM look

Iíll post pics and vids when the work is done.
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Old 23rd July 2018, 08:45 PM   #9
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Okay so the work has been done and results are in.

The guys at StyleDynamics really put in a shift. They worked on my exhaust from 10am until 7pm just to get this job done. It was a ball ache, but it definitely paid off.

Attached below are photos of the process and also a video illustrating the sound.

The car has much more bass in the lower revs, but still maintains the rasp characteristic up top, and also upholds the OEM look.

It might be worth mentioning that the below video was taken the day after the work was done and so the exhaust is not fully broken-in as of yet. After 1,000 miles or so it should be a little deeper.

At the moment I have no plans to install the SS X-pipe but only time will tell.

P.s. this is known on other forums as the "TrueBlue mod" or "Baffle mod".




Backbox off:



Gutting backbox:



Sound insulation removed:



4th chamber removed:



Test fitting of Y-pipe and T pipe:



Adjustments:



1st set of welds taking place:



New pipework:



New pipework 2:



New pipework 3:



Quick polish:



OEM+ backbox:



OEM+ backbox 2:



Putting the exhaust back on the car and back in business:


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Old 31st August 2018, 06:47 AM   #10
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Thank you for the detailed pictures and the comparison video; they really help illustarte the difference in construction and sound.


I have a scorpion system from the manifold back and it has made a very apparent improvement in low end power and I am curious if you have noticed a difference in performance? Regardless your car sounds great!
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Old 31st August 2018, 07:34 AM   #11
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Thanks, I felt as if there was knowledge out there on this sort of project, but I wanted to concentrate it all into one thread. (Took me about 2 weeks to source all info on debaffling).

In terms of power I would say the throttle response has improved but I doubt there been any actual low down torque or top end power gains. (Next month I will put the car on the dyno to see what sheís actually running.)

I think the only way to improve low down torque would be to go for the SS X-pipe. Previously I had a SS Y-pipe and SS backbox on my Z4 Coupe and that did make a difference in low down torque.
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Old 31st August 2018, 09:32 AM   #12
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Quote:
Originally Posted by R60BBA View Post

I think the only way to improve low down torque would be to go for the SS X-pipe. Previously I had a SS Y-pipe and SS backbox on my Z4 Coupe and that did make a difference in low down torque.
From my endeavors and only based on my subjective assessment an underdrive pulley kit and a de-cat also helps improve low end torque.
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Old 4th September 2018, 11:24 PM   #13
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That does sound nice
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