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Thread: Novice To Moding - Miltek Exhausts & The Differences

  1. #1
    HullRs3's Avatar
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    Question Novice To Moding - Miltek Exhausts & The Differences

    Ok, I am going to have to be honest here people. I know sweet F.A. about exhausts and the different types, and which ones are better.

    I was under the impression that the Miltek Cat Back Exhaust was probably the best to by for the RS3, but being around £1,000 not everyone goes for this option, so am I right that a Miltek Cat Bypass Exahust is just as good, just not as expensive?

    I haven't a clue with regards resonating and non resonating exhausts really, & I also know you can get them in different finishes - black or chrome.

    I want to replace my standard exhaust hopefully sometime this year in the next few months, possibly between July & before AIP if possible. This gives me plenty of time to save up an extra funds.

    Basically, was slightly disappointed when received my car as it didn't sound anything like Audi RS3 playing in the snow in Canada - YouTube but just kept my disappointment surpressed. So looking for an exhaust that will not p*ss off the neighbours whilst in standard mode until I get to the end of my street, then I can wake the living dead as it were whilst keeping the flappy valve device in the existing exhaust.
    I am not at the moment looking at turning my car into a jet propelled rocket ship, so fitting an ECU is not on my list of priorities, although I do not want to spent mega bucks on an exhaust..... The £1,000 quote I believe was from a local Audi Specialist Performance & Prestige garage.

    So those who have there's modified which is better, or any advice please people?

    Many Thanks,
    John

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  3. #2
    Kelza's Avatar
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    Hi mate 1k is just for the cat back, cat bypass is about £190 and just gives you a louder exhaust note ....
    Audi RS3 Sportback S tronic Milltek exhaust
    Non-res is the louder exhaust ....
    i see your not too far from statllers in sheffield ,u should pop in and chat to steve jnr..
    http://statller.net/
    robbiemac likes this.

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    A milltek catback exhaust will give better flow for the exhaust gasses & better sound,or if you really want to open up the exhaust gasses then get a full system(catback+sportscat).think it's around 2k,a cheaper option is to get the cat gutted by mrc,they charge around £400 to do the job...

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    John - I went for the cat back exhaust from Miltek, with secondary bypass pipes and resonated. This in my opinion gives the car a very 'classy' note, rather than a boy racer sound. I've had it fitted since early Jan and I love it, makes the car sound awesome - if you do get it you won't be disappointed. It's also fairly easy to fit, took around 30 minutes. On price I think I got all the work done for around £900, bought the parts online and then my cousin was able to do the fitting.

  6. #5
    klauster's Avatar
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    I must be the only person on here to think the Milltek RS3 system actually sounds worse... I had a non res milltek on my RS4 and that sounded amazing with the flaps open... not sure I can say the same about Milltek's attempt on the RS3. I have ended up going for the secondary cat bypass for now....
    www.SubZerosystems.co.uk - IT Consultancy

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    Maybe its not fair to try and compare the RS3 note to that of the RS4. As I've come from a Mini JCW to an S3 then an RS3 I might be a little less experienced, but for now the system is perfect for me.

  8. #7
    MBK
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    I've had a few Milltek systems (modified Scoobies etc) in the past and I wouldn't personally spend the cash just for extra sound. If you were going for the remap too then it starts to make more sense (though I'd stay away from that with this prop failure issue that has arisen). There was an RS3 at Oulton Park a few weeks ago with the Milltek cat back and the added noise was quite subtle. I'd try and find someone who's already had this done and see what you think then. The cat bypass pipes sound a good deal if it's just the sound you are after.

    You can't trust the sound on Youtube clips etc, it's as easy to adjust the sound as it is to photoshop an image.

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    Glad you started this one john.

    i'm trying to understand this as well, so refering to the picture on the website, can someone confirm my suspicions?

    I'm guessing:-

    A is the OEM exhaust

    B is the cat Back system

    C is the bypass pipes

    So can you install the Bypass on the original. and in doing so i guess you have to cut the original as i see no joint just before the back box?
    In cutting the original is it possible to remove the bypass and refit the original if needed using sleeve joints (if they exist)?
    Will the Bypass fitting cause the car to fail an MOT on an emission test?

    Milltek LABELLED.jpg

    One of 750 RS3, Ibis White, Buckets, Privacy glass, Black styling, Cruise control, Bose, Scorpion Cat Bypass pipes.

  10. #9
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    Quote Originally Posted by Mr_Freeze View Post
    Glad you started this one john.
    So can you install the Bypass on the original. and in doing so i guess you have to cut the original as i see no joint just before the back box?
    In cutting the original is it possible to remove the bypass and refit the original if needed using sleeve joints (if they exist)?
    Will the Bypass fitting cause the car to fail an MOT on an emission test?
    Hi Mr F!

    ....yes you can install a bypass pipes (consist of 2 x pipes) on a OEM exhaust, they come with a flange fitted to one end and the other end joins onto the existing pipe with the original in-line collar fixing so they just replace the secondary cats and job done!....Milltek and Scorpion both sell these...they also fit each manufactures replacement systems.

    Regarding the MOT then I'm not sure, but a friend of mine has a TT-RS with them on and his car passed the MOT with them in-place.

  11. #10
    Kelza's Avatar
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    milltek Secondary Decat pipes,not mine

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    Hi Cat,

    so if i understand you correct, there's another section to this which i missed off the original picture.

    I'm guessing that "D" is the bypass pipes, so if thats the case, what is the section labelled "C" called?

    Milltek LABELLED.jpg

    One of 750 RS3, Ibis White, Buckets, Privacy glass, Black styling, Cruise control, Bose, Scorpion Cat Bypass pipes.

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    Quote Originally Posted by klauster View Post
    I must be the only person on here to think the Milltek RS3 system actually sounds worse... I had a non res milltek on my RS4 and that sounded amazing with the flaps open... not sure I can say the same about Milltek's attempt on the RS3. I have ended up going for the secondary cat bypass for now....
    Nah i have to agree, I think the cat bypass sounds just right. The non V engined cars can sound a little bit farty with a full system i think.

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    But would you get better gains in bhp & lbft if you get the milltek sportscat & turbo elbow instead of replacing the bypass pipe?i know it costs more..

  15. #14
    CatnipRS3's Avatar
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    Quote Originally Posted by Mr_Freeze View Post
    Hi Cat,

    so if i understand you correct, there's another section to this which i missed off the original picture.

    I'm guessing that "D" is the bypass pipes, so if thats the case, what is the section labelled "C" called?

    Milltek LABELLED.jpg
    "D" Is correct!

    "C" is a MAIN cat replacement pipe, so once fitted the car will have no cats at all, well assuming you have the secondary cats bypassed also.

  16. #15
    P_G
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    "C" is not the main cat replacement pipe, it's replacement of the resonators on 'B' (the two cylinders prior to the merge / bend into one pipe to go to the back box) in the cat back system to make it non-resonated. Main cat replacement elbow is about half the size of 'C'

  17. #16
    P_G
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    I'm not convinced by the sound of the Milltek RS3 sytem either, the Scorpion one sounds much better but it should do being Titanium and the price that it is. But then I have always wondered about the merits of titanium exhausts cost to benefit on family hatches. GTR's and GT3RS fair enough but an RS3?

    To the OP, anything you change after the primary cats will give you limited gains but more / better noise. When you fettle the main cat that is where the power gains are. However be aware that there is currently no aftermarket exhaust that is type approved for this car so if you do not have a friendly MOT station in a couple of years time or get stopped by the lovely VOSA people they can ask you to take the CAT out and put back to OE and if you do not then fine you £5k per non-type approved cat. It's a small risk but a risk nonetheless.

    Gutting the primary cat would get you round this because the OE part is in place (albeit empty) but it would fail emmissions if you have removed the secondary cats as well (good thing with secondary cat bypass is the increase in emmission with them not being there is nominal and within tolerance even though it is technically 'a race part'). Personally I couldn't be doing with the hassle of changing it in an out every tme for MOT. For me there are enough gains to be had with intercoolers, turbo's, induction / filters, remap etc. not to really bother. A good cat back, performance filter and remap plus intercooler would give you the same if not better gains than a poor map and a race / gutted cat. And by changing the primary cat in any way shape of form you will need a remap as well.
    Last edited by P_G; 13th March 2013 at 11:56.

  18. #17
    45bvtc's Avatar
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    Will the Bypass fitting cause the car to fail an MOT on an emission test?

    Mr_Freeze raises a very good question: as from January 1st 1993 the following has been applicable to "ALL 4-wheel, petrol driven, passenger carrying motor vehicles" sold within the EU:

    "On the 26th June 1991 the Council of European Communities introduced an amendment (91/441/EEC) to an earlier Directive (70/220/EEC) relating to measures to be taken against air pollution by emissions from motor vehicles."

    What this meant was that from January 1st 1993 all motor vehicles sold within the EEC had to employ a catalytic converter within the exhaust system in order to reduce exhaust emissions. However, during 1993, dispensations were issued to allow vehicles that had been manufactured before 1st January 1993 without catalytic converters, to be sold.

    This dispensation would NOT apply to an RS3!


    The existing rules applicable to the exhaust system when undertaking an MOT inspection are clear, and begin:

    1. Check the security of the exhaust system

    2. With the engine running, check the exhaust system for leaks

    3. On vehicles that qualify for a full cat emissions test, check the presence of the catalytic converter


    And the existing rules for rejection begin:

    1. An exhaust system not adequately supported

    2. A major leak of exhaust gases from any part of the system

    3.
    A catalytic converter missing where one was fitted as standard!


    So take care: even if a friendly MOT testing station provides you with an MOT certificate, a roadside inspection (even post accident) could mean that you're RS3 does NOT comply with current rules/legislation and may be deemed "unsuitable for road use".

    Note: In 1993/4, the Type Approval of several motor vehicles was my responsibility...

  19. #18
    P_G
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    Whilst 45bvtc is right the legislation was brought out when cars only had one catalytic converster, the B7 RS4 had 4! The RS3 has 2; if the main cat is undisturbed and the secondary one removed it will still pass emmissions. If you alter the primary and have no secondary you'll have problems. If you look at the way the secondary cat is installed and designed, it does look like an afterthought to try and further reduce emmission for Euro IV regs. as there are no sensor near it suggesting the bulk of the emmissions is dealt with by the primary cat.

  20. #19
    45bvtc's Avatar
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    I'm so with P_G in his logic and argument, however...

    The crazy issue in all of this is that a catalytic converter is an unnecessary item. Engine designers were developing lean-burn low-emission engines in the 90's but, as the EU had already financed the build of a catalytic converter factory (in Belgium?), the EU introduced legislation to ensure the products of that factory were fully used.

    So, P_G is quite right when he refers to the volume of emissions now produced by modern engines, it's just sad that we're governed by those di*kheads in Brussels, or is it Strasburg (depending on the month of course - don't get me started...).

    However, I strongly advise caution as the 'trade' are well aware of the OEM exhaust arrangements of modern cars and that last thing I would want is for my insurance company, after some 'pillock' has used my car for braking purposes, to tell me that my non-OEM exhaust system has invalidated my insurance, and I'll bet those bas#ards would...

  21. #20
    P_G
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    It goes without saying that all mods should be declared. Don't expect the cost of them to be though.

  22. #21
    nile's Avatar
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    Hello everyone, I just want to point out the label on the secondary bypass pipes, I have the cat back res with pipes fitted for at least a year now, sounds amazing I luv it.
    But I was in for the 15k service the other week, complaining of brake noise and maybe a wrapped disc, the tech had the car up on the ramp and noted the bypass pipes both have a label saying not for road use!
    Then he refused to test drive the car for the other issues I described.
    Maybe there are other miltek road use pies, not sure but I collected my oem pipes from unit20 so audi can tick their box.
    The exhaust spec was sent to my insurance and noted, but this was a shock and I inisisted on seeing the steel labels myself in the workshop.
    RS3 Black

  23. #22
    P_G
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    The plates in question are on all the Milltek cat bypass pipes. However that said I would be interested to see how your dealer believes they invalidate the entire warranty of the car to the point they refuse to work on it? They will only affect the rear exhaust system and have sod all to do with your brake issue or any other issue you may have. If they don't budge take it elsewhere. From experience aftermarket exhaust systems and air filters do not invalidate the warranty on Audi's.

 

 

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