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  #11  
Old 10th June 2017, 03:03 PM
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Original threads on what Michael did and I then procured from him are -
HERE and also HERE
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  #12  
Old 10th June 2017, 03:06 PM
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Quote:
Originally Posted by Ameiseuk View Post
straight through back box sounds like an interesting project.
Probably one of the best mods on a V8. The straight pipe just unleashes that V8 burble on startup and idle, and when you put your foot down... glorious sound!

I was quoted £80 from someone who does it locally.
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My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror
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  #13  
Old 11th June 2017, 07:10 AM
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Quote:
Originally Posted by steamship View Post
Probably one of the best mods on a V8. The straight pipe just unleashes that V8 burble on startup and idle, and when you put your foot down... glorious sound!

I was quoted £80 from someone who does it locally.
.....Has anyone cut open the back box, gutted the gubbins and run 2 straight pipes through. Keeps the OEM look, no issues with MOT and more burble?
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  #14  
Old 11th June 2017, 06:55 PM
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Question Are we counting the 20 interested folks or what?

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  #15  
Old 20th June 2017, 01:56 PM
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I got a back box from our forum sponsors a while ago so I could gut the internals. So far I've removed the top of the silencer casing to see whats inside and how to re-pipe it inside, sorry dont have pics yet, but theres only 2 pipes need cutting/replacing in there, one pipe looks easy enough to replace but the second pipe looks a bit more involved because of the angles/routing of the second pipe as inside the silencer itself is just pipes and baffle plates which need to be removed before I can install new pipes in there. Hopefully pictures to follow but please dont hold your breathe as the weather has been so good I've been spending most of my free time out on my bike lol!
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  #16  
Old 26th June 2017, 09:08 AM
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Quote:
Originally Posted by MikkiJayne View Post
Just straight-pipe the back box. Neil's 3.7 sounds gorgeous

I'm going to do it to mine as soon as it stops being broken - I'll document what I do, and make jigs so I can repeat it
By straight pipe, do you mean a straight through style muffler (so a straight perforated pipe with sound deadening still in the box)?
Or straight solid pipes replacing the muffler?

I had a straight through cat back system on my old V8 Commodore. Single system 2.5" straight through muffler and resonator.
Sounded bloody fantastic and I'd love to repeat the experience with the S8.

The S8 is a single pipe between the two boxes yes? Is it 63mm (ie: 2.5")?
It would be quite easy to get an exhaust place to make up a straight through resonator with off the shelf piping and box.
So long as there's a resonator there, it shouldn't fail MOT there should it?
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- has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!

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  #17  
Old 26th June 2017, 09:38 AM
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Quote:
Originally Posted by 27litres View Post
By straight pipe, do you mean a straight through style muffler (so a straight perforated pipe with sound deadening still in the box)?
Or straight solid pipes replacing the muffler?
Check out the photos in this post that Neil linked to above:

http://forum.a8parts.co.uk/showpost....42&postcount=1

It shows exactly what was done.
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My DIY jobs - Replaced alarm horn, Replaced Coolant Temp sensor, Updated RNS-D firmware, Installed Reversing Camera and Digital TV, Dashcam Installation, Retrofitted Rear Blinds, Auto-Dimming Rear View Mirror
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  #18  
Old 26th June 2017, 10:19 AM
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Goran Goran is offline
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Quote:
Originally Posted by Ameiseuk View Post
.....Has anyone cut open the back box, gutted the gubbins and run 2 straight pipes through. Keeps the OEM look, no issues with MOT and more burble?
Tennohund from A8freunde did this and welded up the back box back up. I believe he did the same thing to the middle box. He had several youtubes and the sound was really good (to my ear anyway). Unfortunately he removed most of the clips. Actually one clip still remains, found it.

https://www.youtube.com/watch?v=vmTBmFLsGUY&t=22s



https://www.motor-talk.de/forum/spor...55.html?page=3
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Last edited by Goran; 26th June 2017 at 10:23 AM.
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  #19  
Old 26th June 2017, 01:30 PM
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Quote:
Originally Posted by 27litres View Post
The S8 is a single pipe between the two boxes yes? Is it 63mm (ie: 2.5")?
Two 55mm pipes...
Really should pay more attention when I'm climbing around under it on the hoist!
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Current:
2001 Audi S8 - Brilliant Black with Black interior, Solar Sunroof, Tinted side and rear glass, RNS-D, XCarLink, Bose, clunky old phone in arm rest!
2002 Audi S8 - Project
Replacement head coming thanks to MJ
Avus Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that).
Family:
2009 Volvo XC90 V8 R Design
- has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!

Sold:
1997 Audi A4
- Hamilton's Club Sport, Achat Grey (will miss the old girl)
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  #20  
Old 26th June 2017, 01:39 PM
MikkiJayne MikkiJayne is offline
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Straight pipe as in two parallel pipes from the middle box to the tailpipes, Just like Neil's although I'll make the join in the straight section. Its perfectly MoT friendly - as long as its not leaking or ear-bleedingly loud they don't care what boxes go where. That would be important in Germany though as TÜV does care that the stock exhaust is still intact (unless you have paperwork for a certified aftermarket system) so Tennohund's mod makes sense in that context.

55mm stainless is a pain to get hold of and has to come from Germany as everything in the UK is imperial sizes. A4 TDI exhausts are 55mm though so I may just cut one of those up and re-use that to make the join and then weld that to some standard 57mm stainless. Tailpipe choice is the next thing to figure out, as the S8's stock tip is a bit weedy by modern standards. I'm thinking a couple of 75mm black chrome Q5 tailpipes might look quite nice instead
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Last edited by MikkiJayne; 26th June 2017 at 01:42 PM.
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