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New Custom Exhaust (3.0tdi)

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by jjmurphy21187, Nov 1, 2012.

  1. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    Finally got my exhaust fabricated and thought I would post a few pics. 316 stainless steel construction (apart from the tips which are 304 because they had to be bought). Really pleased with the results! Only downside is the speed at which the tips become blackened! Video doesn't do it justice...

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    4" Slashed tips (pardon the cable ties, before the hangers were on)

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    Decided to have the tips removable so they could easily be changed if necessary later


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    Tricky bit to go round the quattro...

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    Video: Audi A4 Cab :: 00008.mp4 video by jjmurphy21187 - Photobucket
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  2. ANDYTQ
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    ANDYTQ Member

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    Nice jj but will it pass the noise test at combe!
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  3. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    Ha, that remains to be seen. But when it's not under load it isn't too loud (not that I have a decibel meter)
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  4. astradti16v
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    astradti16v Member

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    Very nice!, what sort of price would he charge for something the like that?
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  5. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    Would've been £750 but the extra flanges for the tips was another £80. Not a cheap option but he can fabricate more or less anything you want and the craftsmanship is 2nd to none
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  6. solaris
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    solaris Member

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    Now that looks like a quality bit of work. Where was that exhaust made?
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  7. A4_MaJiK
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    A4_MaJiK Active Member

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    Would you mind saying what the setup is in full, for example regarding the catalyst, DPF, secondary cat, silencers etc. I'm looking to get something to improve my exhaust note on mine and unleash the growl (2k rpm +) of the V6 but don't want something too loud as I'm on the motorway everyday and have had bad experiences with boomy exhaust systems.
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  8. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    It was made by an independant in Nottingham, 'Wright Bro's Autos' and the guy's name is Dale. Doesn't have a website unfortunately but he came recommended to me and has done a few other audi exhausts.

    He sent me a few pics of others he's done, A6, RS6 and Carl's A4, which I can forward if anyone's interested: drop me a PM

    Setup is as follows: 1st CAT & downpipe is standard, from the downpipe back has all been replaced. Already had the DPF gutted/mapped out so no additional mapping was needed for the new exhaust. Downpipe goes into a straight through silencer (maybe 14" long?), then the pipe splits just before the quattro box and goes round the support struts/ARB etc, then two 4" tips on the end (no backboxes).

    I was after exactly the same thing as you MaJiK, but honestly there is a bit of drone which unfortunately falls just at cruising speed (1700-2000rpm). Now I've been looking into ways to counter this and aside from coating the floor of the car in sound deadening material, I found the concept of adding a 'Side-Branch Resonator' which can be used to eliminate specific resonant freqnencies. Sounds like a good idea and it's what companies like Miltek use inside their backboxes to give a 'tuned' system:

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    According to my calculations (lab coat on at this point), for a 6 cyl engine with a resonante freq of 'X', the pipe length should be 'Y':

    RPM = 1700 L = 1.009m
    RPM = 1800 L = 0.953m
    RPM = 1900 L = 0.903m
    RPM = 2000 L = 0.858m
    RPM = 2100 L = 0.817m
    RPM = 2200 L = 0.780m

    So ideally you'd make the pipe length adjustable to change the frequency response, as the res freq changes which exhaust gas temps (hence why the sound different on start-up and after a run) and it's not an exact science. But if the side res runs parallel to the main exhaust it HAS to be a mandrel bend, otherwise it messes with the pressure waves and doesn't work correctly...

    Found this on a US forum for Corvettes and Trucks, a lot of those guys swear by it. Having said that those guys have V8s which require a shorter pipe length to get the same res freq...
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  9. ANDYTQ
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    ANDYTQ Member

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    Ive seen a exhaust on a a4 with one of those fitted on a US site might have been on audizine
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  10. A4_MaJiK
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    A4_MaJiK Active Member

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    Brilliant response thanks for that. I may just do the same setup as you have but have back boxes in place to counter the drone at cruising speeds. My only concern as I've probably mentioned many of times is the increase in smoke after the DPF removal.
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  11. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    Any idea if it was effective at getting rid of the drone at crusing speed?? Going to enquire about cost of adding this later...

    Might be worth considering the Miltek... if you can get a good deal...

    PS: You could always use the 'Thanks' button :yahoo:
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  12. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    What I also meant to say in that post :keule: was that I've never had excessive black smoke after removing the DPF. It can depend on your map and if it's done properly (so I've read), but I've never seen a cloud of black left in my wake in the rear-view... slight hazyness at night through headlights, but that's normal...

    If you want to swing by Nottingham you're welcome to have a listen before shelling out £xxx!
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  13. Chr1sch
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    Chr1sch Member

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    Sounds lovely!
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  14. Molnboman
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    Molnboman Well-Known Member

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    Lovely bit of welding that.....classy....can we get a listen to them on YT?
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  15. fishyfish
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    fishyfish Member

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    I agree, those welds are just spot on... makes the workmanship on the Milltek system I have (gets fitted on Monday! woo!) look pretty average, I can tell you.
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  16. jjmurphy21187
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    jjmurphy21187 Tiptronic

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    Cheers guys :arco:

    I'll try to get to grips with youtube and post a link... does the photobucket vid not work??
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  17. jjmurphy21187
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    jjmurphy21187 Tiptronic

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