Custom header-back exhaust
#1
Former Vendor of MBWorld
Thread Starter
Join Date: Jul 2006
Location: In a box
Posts: 2,513
Likes: 0
Received 0 Likes
on
0 Posts
W211 E55
![Wink](https://mbworld.org/forums/images/icons/icon12.gif)
CPT let their fabrication wizards go on my exhaust, and this is what they came up with.
I was jealous of AMG Rider's exhaust sound - mellow at idle, but hell-raising at full-throttle. I wasn't able to duplicate it, but the results were acceptable.![Stick Out Tongue](https://mbworld.org/forums/images/smilies/tongue.gif)
The closest thing I've heard to it was coming from a big-block Chevelle sporting a Gear Drive timing set (quiet version.) It's a muscular sound at full-tilt, to say the least. I can't wait for headers.![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
The final setup was a stainless 75mm straight-pipe to the stock mufflers. Primary cats replaced with SS 200-cell, SS flex section to prevent header stress, V-band clamps, and provisions for DMH low-profile cutouts.
Here's some pics after 2000 miles on the car:
![](http://i32.photobucket.com/albums/d18/ChicagoX/b0f2ca1f.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/58b48953.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/3fe3aa75.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/91e10352.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/0e016c7a.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/3ea7d993.jpg)
Here's a shot of the LET Heat Exchanger, after a few miles:
I was jealous of AMG Rider's exhaust sound - mellow at idle, but hell-raising at full-throttle. I wasn't able to duplicate it, but the results were acceptable.
![Stick Out Tongue](https://mbworld.org/forums/images/smilies/tongue.gif)
The closest thing I've heard to it was coming from a big-block Chevelle sporting a Gear Drive timing set (quiet version.) It's a muscular sound at full-tilt, to say the least. I can't wait for headers.
![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
The final setup was a stainless 75mm straight-pipe to the stock mufflers. Primary cats replaced with SS 200-cell, SS flex section to prevent header stress, V-band clamps, and provisions for DMH low-profile cutouts.
Here's some pics after 2000 miles on the car:
![](http://i32.photobucket.com/albums/d18/ChicagoX/b0f2ca1f.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/58b48953.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/3fe3aa75.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/91e10352.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/0e016c7a.jpg)
![](http://i32.photobucket.com/albums/d18/ChicagoX/3ea7d993.jpg)
Here's a shot of the LET Heat Exchanger, after a few miles:
![](http://i32.photobucket.com/albums/d18/ChicagoX/b905bf42.jpg)
#4
Member
Join Date: Jan 2007
Location: under my roof
Posts: 137
Likes: 0
Received 0 Likes
on
0 Posts
w211e55
is that one of Chris Jannasch creation ?
suhweettt...been wanting to get the exhaust done ...but I just have no time to send the car out.
sound clip would be nice Sir ...
suhweettt...been wanting to get the exhaust done ...but I just have no time to send the car out.
sound clip would be nice Sir ...
#5
Former Vendor of MBWorld
Thread Starter
Join Date: Jul 2006
Location: In a box
Posts: 2,513
Likes: 0
Received 0 Likes
on
0 Posts
W211 E55
Trending Topics
#9
Super Moderator
Nice. Have you run it uncorked?
Zora Arkus-Duntov specifically excluded an h/x-pipe so that his machine’s would sound that much more menacing.
Hurry up and install those LET manifolds.
Zora Arkus-Duntov specifically excluded an h/x-pipe so that his machine’s would sound that much more menacing.
Hurry up and install those LET manifolds.
#10
if you don't have crossover you are leaving HP on the table. a crossover is necessary for both performance & sound reasons, it helps improve scavenging and top end flow as well as cancels out the pulses for much higher quality sound. If you want more power put an X-pipe in there.
#11
Out Of Control!!
Join Date: Sep 2004
Location: San Diego
Posts: 13,394
Likes: 0
Received 4 Likes
on
4 Posts
2015 S212
if you don't have crossover you are leaving HP on the table. a crossover is necessary for both performance & sound reasons, it helps improve scavenging and top end flow as well as cancels out the pulses for much higher quality sound. If you want more power put an X-pipe in there.
#12
MBWorld Fanatic!
Que no?
#14
Out Of Control!!
Join Date: Sep 2004
Location: San Diego
Posts: 13,394
Likes: 0
Received 4 Likes
on
4 Posts
2015 S212
Each cylinder has it's own exhaust port, so you don't have one constant linear flow of air through the pipes, you have 8 individual pulses flowing through the pipes. The engine fires side to side; so you have one pulse, then a gap, then another pulse flowing through the pipe. When using straight pipes the pulses just continue on their path and exit the muffler. When having a crossover such as an x-pipe, the pulses come together and push each other through, increasing their velocity. Instead of having; left bank > gap > left bank > gap, through a pipe, you now have: left bank > right bank > left bank > right bank, and the opposing bank pulses are pushing each other through the exhaust making it more efficient in scavenging exhaust from the engine.
Que no?
Que no?
#15
MBWorld Fanatic!
Think of it this way; if you had a mesh screen over each exhaust port on the cylinder head, between the head and the headers, you would be choking your system and thus see lower power numbers and lower performance. So by taking that restriction out, you allow your spent exhaust to leave the engine as fast as possible. That's what the x will do, it will allow the spent exhaust to leave the engine as fast as possible.
That's the way I've always understood it. I'll admit though that I don't know jack isht about Merc engines and their exhaust engineering, so I don't really know how the engine reacts to a more free flowing exhaust. I think that respect to our engines (55k) the x-pipe isn't really making the exhaust more free flowing, rather it is making it more efficient. Now if you had straight pipes from the headers to the tips, that wouldn't be the business lol.
#16
Former Vendor of MBWorld
Thread Starter
Join Date: Jul 2006
Location: In a box
Posts: 2,513
Likes: 0
Received 0 Likes
on
0 Posts
W211 E55
While theory says that an x-pipe would assist with scavenging, I have yet to see an exhaust make power. This install is purely a method by which to scare animals and small children. The headers are coming, and those will be expected to bump up the HP a bit.
#17
Out Of Control!!
Yea, I took the muffler and resonator off once and it was loud as SHYTE!
Last edited by blackbenzz; 06-29-2008 at 04:38 PM.
#19
Former Vendor of MBWorld
Thread Starter
Join Date: Jul 2006
Location: In a box
Posts: 2,513
Likes: 0
Received 0 Likes
on
0 Posts
W211 E55
Did the charring give it away? ![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
I have some DMH low-profile electric cutouts going in their place. AL@CPT installed the switch where the ciggy lighter goes in the ashtray area. The turndowns needed extending a bit; I'll post pics/sound clips once they are back on the car.
![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
I have some DMH low-profile electric cutouts going in their place. AL@CPT installed the switch where the ciggy lighter goes in the ashtray area. The turndowns needed extending a bit; I'll post pics/sound clips once they are back on the car.
![devil](https://mbworld.org/forums/images/smilies/devil.gif)
#20
Super Member
Join Date: Sep 2006
Location: Bay Area/ NY
Posts: 772
Likes: 0
Received 0 Likes
on
0 Posts
07 SLK55, 08 R32
#21
MBWorld Fanatic!
Join Date: Jul 2006
Location: Los Angeles, CA
Posts: 1,414
Likes: 0
Received 0 Likes
on
0 Posts
2005 E55
Did the charring give it away? ![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
I have some DMH low-profile electric cutouts going in their place. AL@CPT installed the switch where the ciggy lighter goes in the ashtray area. The turndowns needed extending a bit; I'll post pics/sound clips once they are back on the car.![devil](https://mbworld.org/forums/images/smilies/devil.gif)
![Big Grin](https://mbworld.org/forums/images/smilies/biggrin.gif)
I have some DMH low-profile electric cutouts going in their place. AL@CPT installed the switch where the ciggy lighter goes in the ashtray area. The turndowns needed extending a bit; I'll post pics/sound clips once they are back on the car.
![devil](https://mbworld.org/forums/images/smilies/devil.gif)
![thumbs](https://mbworld.org/forums/images/smilies/thumbsup.gif)