S4 Downpipe options

Boosted_Six

Registered User
http://millteksport.com/exhaust.products.cfm?variantid=1554

For the B9 S4 / S5 it looks like Milltek have three options:

  • Cat bypass / Test pipe
  • Milltek downpipe using 200 cell HJS core
  • HJS EC Approved 200 cell downpipe
Its obvious the cat bypass is illegal for use on the road so I will skip to the other two. The question is... Is the Milltek 200 cell cat still UK road legal if it isn't EC approved? Will it trigger a C.E.L? Will it invalidate insurance even if declared, as it's a non compliant part of the emissions system?

If the answer to any of the previous questions is yes, what is the point of it even being developed and sold, as the only sensible option is to buy the HJS EC approved version for driving on the street? I'm confused as both the Milltek own brand and HJS item seem to be using the same 200 cell core, one has some heat insulation and the other not. So is the 600 quid difference purely down to the HJS own brand one having undergone the rigor of approval?
 

Daggerit

Registered User
http://millteksport.com/exhaust.products.cfm?variantid=1554

For the B9 S4 / S5 it looks like Milltek have three options:

  • Cat bypass / Test pipe
  • Milltek downpipe using 200 cell HJS core
  • HJS EC Approved 200 cell downpipe
Its obvious the cat bypass is illegal for use on the road so I will skip to the other two. The question is... Is the Milltek 200 cell cat still UK road legal if it isn't EC approved? Will it trigger a C.E.L? Will it invalidate insurance even if declared, as it's a non compliant part of the emissions system?

If the answer to any of the previous questions is yes, what is the point of it even being developed and sold, as the only sensible option is to buy the HJS EC approved version for driving on the street? I'm confused as both the Milltek own brand and HJS item seem to be using the same 200 cell core, one has some heat insulation and the other not. So is the 600 quid difference purely down to the HJS own brand one having undergone the rigor of approval?

I don’t know the technicalities in terms of the law regarding it to be honest. I’d imagine so long as it can pass it’s MOT then I imagine it would be considered legal?

In terms of price, how much is the HJS one? If it’s more than the Milltek then you’re talking £1,500+ surely? That’s a lot for a downpipe!


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Daggerit

Registered User
Holy ****!
 

Boosted_Six

Registered User
I've emailed both the UK disti and the US disti for comment. The UK is completely non committal on CEL for either item, but says both with pass emissions testing.

The US chap says hes been running the Milltek item on his personal B9 S4 for 8-9 months with no CEL.
 

SMI77

Australia
The Milltek branded item is 1200 - 1400 pounds and the HJS one is 2000 - 2200!

Holy ****!

Sorry mate, can not resist.
The HJS, is that English pounds or Scottish pounds? :wink new:
http://www.hjs-motorsport.de/products/tuning/ece-downpipes.html
With that cost, no surprise one of their 'partners' is ABT!
A European outlet does have them for Euro 2088 = GBP 1840.

Closer to the Highland budget:-
http://www.all-stars-motorsport.com...cts-turbo-decat-downpipe-cts-exh-tp-0009.html
"FREE SHIPPING TO EUROPE OVER 250€" - so, are you people 'in' or 'out', at this point in time?
 

Daggerit

Registered User
Sorry mate, can not resist.
The HJS, is that English pounds or Scottish pounds? :wink new:
http://www.hjs-motorsport.de/products/tuning/ece-downpipes.html
With that cost, no surprise one of their 'partners' is ABT!
A European outlet does have them for Euro 2088 = GBP 1840.

Closer to the Highland budget:-
http://www.all-stars-motorsport.com...cts-turbo-decat-downpipe-cts-exh-tp-0009.html
"FREE SHIPPING TO EUROPE OVER 250€" - so, are you people 'in' or 'out', at this point in time?

Didn’t realise that CTS had an option but I wouldn’t want to go decat because the CEL would **** me off...

I’ll maybe just save for the Milltek 200 cell version.


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Boosted_Six

Registered User
The Chap in the US saw a 10th of a second drop from the 0-60 time with a catback, once he added the 200cell downpipe, he dropped another 0.4 of a second. Thats got to be close to 3/4 of a second off the quarter mile from a downpipe alone, no tuning!
 

Boosted_Six

Registered User
Quick update: bought the Miltek 200 Cell non EC item. This choice was based on the logic that its a OEM quality HJS core and anecdotal evidence that this doesn't trigger a CEL. Will find out soon enough...
 

EssVier

There ain't no party like an S-Club Party.
Quick update: bought the Miltek 200 Cell non EC item. This choice was based on the logic that its a OEM quality HJS core and anecdotal evidence that this doesn't trigger a CEL. Will find out soon enough...
Any update on the DP? Tempted to get it as a Christmas present to myself!
 

Popeye64

Registered User
Hi, I had a Miltek cat back fitted to my S4 B9 last year. The guys that fitted it told me they wouldn't advise putting the Miltek Sports Cat and down pipe on as it can throw up fault codes so the engine needs a remap at the same time. Is this true or a lot of cods whallop?
Thanks.
 

Daggerit

Registered User
Hi, I had a Miltek cat back fitted to my S4 B9 last year. The guys that fitted it told me they wouldn't advise putting the Miltek Sports Cat and down pipe on as it can throw up fault codes so the engine needs a remap at the same time. Is this true or a lot of cods whallop?
Thanks.

Well since there’s no remap it would make that part pretty difficult... Haha.


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Daggerit

Registered User
Yep That's true. I did a ring round last week still no joy on anyone releasing one soon. Anyone heard anything?

Nah. I’d expect big tuning places like Revo and APR to be amongst the first and they haven’t managed. I did hear they’d managed to tune it but the ECU wiped it as soon as the car was restarted, I don’t know how true that is and I’d love to know what power they managed doing that...


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Popeye64

Registered User
Nah. I’d expect big tuning places like Revo and APR to be amongst the first and they haven’t managed. I did hear they’d managed to tune it but the ECU wiped it as soon as the car was restarted, I don’t know how true that is and I’d love to know what power they managed doing that...


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Ive been checking the APR website periodically still nothing on there. I would imagine the figures would be up in RS4 territory that's probably the main reason Audi have made it so difficult and so only gives you one option is parting with the extra £30k + to buy one. Its only a matter of time before someone cracks it.
 

cuke2u

Registered User
I wouldn't be so confident, the best ECU tuners have been at it for years, and not just with Audi's either as the same unit is fitted to other manufacturer's vehicles as well. Audi are spreading tamper proof ECU's across the range also....
 

Boosted_Six

Registered User
Hi, I had a Miltek cat back fitted to my S4 B9 last year. The guys that fitted it told me they wouldn't advise putting the Miltek Sports Cat and down pipe on as it can throw up fault codes so the engine needs a remap at the same time. Is this true or a lot of cods whallop?
Thanks.

I've covered 12k miles with no warning lights and no error codes. As already stated, a remap does not exist for this car so those statements are wrong on all counts...
 
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