Milltek backbox 20 people needed :)
 

Emailed milltek last night asking if they could or would be able to reproduce a milltek backbox again for the audi a8/s8 d2 as they are no longer in production interestingly they came back with this answer.

Hi

Thank you for your enquiry.

As stated we have now discontinued this system and we wouldn’t be able to produce a single or couple of systems as the cost to swap the production lines over for a small quantity is too high.

We still have the jigs and are able to produce them but we wouldn’t look to produce in quantities less than 20.

Kind regards

Milltek Sport Ltd

Still can't see it happening tbh... but good to get a reply. +++

Did they quote a price for each unit or a total price for all 20 units ??:cool:

No further information on individual unit prices, can enquire if interested?

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 :)

Now THAT I would be interested in! +++

True, and not bad for a 3.7 ;)

I've been threatening to do mine as well, but I need to sort out the whining noise first.

You should stop giving lifts to those Northern Irish politicians..... :tuttut:

:rofl:

LOL, as my dad always says when the unusual hapoens (especially with politics) "may you live in interesting times"

Meanwhile, back on topic..... straight through back box sounds like an interesting project. Theres an exhaust place near us who do all sorts of interesting work, might see if they would be up for this

Original threads on what Michael did and I then procured from him are -
HERE and also HERE +++

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?

Are we counting the 20 interested folks or what?
 

If I know the cost I would commit.

Being committed is what I is good at... M.

Robert

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!

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?

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.

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

http://forum.a8parts.co.uk/attachmen...1&d=1498472600

https://www.motor-talk.de/forum/spor...55.html?page=3

Two 55mm pipes...
Really should pay more attention when I'm climbing around under it on the hoist!

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 :)

I was sure the S8 pipes are 61mm OD? I measured them a few times

.....following this with interest.

My last car was a Nissan Skyline 350GT (4-door 350z for want of a better description) with a 3.5 v6.
It sounded more purposeful than the S8 does - kinda miss the burble.

Trying to see if I can get some of that burble back without being too noisy

Realistically, this isn't going to happen, for the following reasons:

(1) You'd need 20 firm commitments from active D2 owners on here - assuming you're not also enlisting significant numbers of additional D2 owners elsewhere... :D

(2) Of a total of around 110 (optimistically..) active members listed on here, at a rough guess no more than 60 of those are D2 owners.

(3) To reach your total therefore, one third of those would need to:

a) Be interested,
b) Be currently (or in the near future...) needing a replacement,
c) Have the spare funds available to spare for this - including an up-front deposit that Milltek would probably ask for,
d) Be willing to commit to payment of this.

There's virtually no chance of this happening, so I think this idea is a non-starter.

I think a far better option is to do one of the following:

(a) Wait for a "spare' used Milltek to come free - unlikely, but still more likely than this plan...
(b) Get someone else to custom make one - likely to be far cheaper, and more tailored to individual needs,
(c) Use Amar's front-end approach to get a similar sonic fix.

I'll go for (a) or (b), and some of the posts on here probably reflect the reality of doing this as well, from what I've seen ;)

https://www.youtube.com/watch?v=8abHWiETPvs&t=8s

I'm not custom exhaust fan, but here is a guy in Germany who will do custom exhaust for 550 euro installed. He is on German A8 D2 forums and on Facebook.

Downpipes are ~60, after the middle box they reduce to 55.

They reduce! hmm that sounds a bit restrictive. Maybe it doesn't matter after that chambered middle box.
I must have measured them before that box, I think I measured somewhere in the middle when the exhaust was off the car.

I agree with Tintin, is Milltek all that? I bet there are custom fabricators out there who can do a much better job.

Supersprint still do one, but they want stupid money for it (~US$850 !!).

They also offer a centre box for a full cat-back job.

I've sent off a query with a performance exhaust mob near me to see what they will charge.
You should be able to flare 2.25" (57mm) OD pipes to fit over the 55mm pipes quite easy, so using a 2.25" twin straight through muffler (can't do straight pipes here) should reduce costs...

If you are going to ditch the middle box, I would stick with the 61mm pipes as before the mid box. No point reducing the diameter if you are doing straight through mufflers?
The stock diameter before the cats, and after the cats is 61mm or 61.5mm

I'll keep the centre box.
Aussie (or should I say Victorian) roadworthiness requirements mean I need to keep two mufflers.
They only do random checks on noise and condition (no yearly MOT), but it's a risk I'm not bothered with, as I suspect I'll get the noise I'm chasing with a new back box.

its a shame but a good bit of info on here, i'll get a complete custom exhaust system made up with sports cats, x pipe etc, round about nov time need more noise +++