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backbox/muffler delete

Discussion in 'A3/S3 Forum (8L Chassis)' started by Steven.c, Jan 25, 2012.

  1. Steven.c

    Steven.c Auto-Motive Restored Deatail

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    Hi all, whats ur opinions on a backbox/muffler delete. I want a louder exhaust worth a more sporty noise but i dont see the point spending over 300 when the Downpipe is the most restrictive part. some might say it sounds like a tank.

    Ive already took the centre section off and replaced it for a TDI one but it hasn't made a difference at all?

    cheers
    steve
     
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  3. Paradox1

    Paradox1 Active Member

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    do you have a s3 or a3? if.its a a3 you can get a down pipe for under 100 quid.now a big difference to sound and performance. if you want a sporty sound and aftermarket exhaust is needed
     
  4. jay1601

    jay1601 Well-Known Member

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    if you want loud. just run off the DP/de-cat. will be very loud will give some loud pops and bangs (my centre sleeve broke the other night) its crazy loud lol
     
  5. sportstractor

    sportstractor Chugger

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    nah mate you need some kind of box to resonate the sound, or it really doesnt sound cool. Get rid of the centre box, decat and downpipe should give you what you want
     
  6. Steven.c

    Steven.c Auto-Motive Restored Deatail

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    ive got no centre box i put a tdi one on it. im just getting bored of a silent car as all my other cars had straight through.
     
  7. Westy

    Westy Well-Known Member

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    I got hold of an S3 backbox for £20 to cut up and play with. Going to use a sleeve to step up from the backbox to 3" piping as I already have a 3" DP and de-cat.

    [​IMG]

    [​IMG]
     
  8. aragorn

    aragorn "Stick a V8 in it!"
    Staff Member Moderator VCDS Map User

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    If the cats still fitted thats where you need to put your attention.

    A good downpipe and a sportcat or decat should make a fair bit of difference
     
  9. jay1601

    jay1601 Well-Known Member

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    fitting a 3DP/de-cat made no difference in noise with the standard exhaust sytem on
     
  10. sportstractor

    sportstractor Chugger

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    Don't say that :( that's what I'm planning on running
     
  11. Westy

    Westy Well-Known Member

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    It did on my S3 mate. Maybe it's different on the A3.

    Mine is well throaty now, love it.
     
  12. Reesy

    Reesy Well-Known Member
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    I can confirm this. Noise feels like its coming right through the floor when you boot it and sounded nice to say you have that gay stock (de)cat back zorst still on it.
     
  13. sportstractor

    sportstractor Chugger

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    Good! Although the s3 sounds pretty aggressive as standard as far as exhaust noise is concerned. But I'm gona keep an eye on you build thread on how you get on with modding the back box.
     
  14. Westy

    Westy Well-Known Member

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    This is a fair bit louder. Lovely sound from 3K revs upwards.

    I should be attacking that backbox this month. I'm going to see how it is just with 3" pipe before I hack it up as Karl's hacked one is too loud he said.

    I'll get some vids :eyebrows:
     
  15. Jason.s

    Jason.s Active Member

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    Yours last night probably sounded louder than my Jetex on idle.

    The extra 3" piping should increase it a touch with any luck. Bigger bore pipework usually does.
     
  16. Westy

    Westy Well-Known Member

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    That's all DP and decat noise, it is a nice improvement.

    Not only will I be expanding the pipe from the decat to the backbox but I'll also be removing that tiny silencer that's just before the box. This should make it sound very nice.
     
  17. DubDestroyer

    DubDestroyer New Member

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    I have done this on my 1.8t q it makes a huge differance from inside the car it sounds like a reno sport 225 with the 'wooshing' sound but it sounds good and i get the occasionall pop/bang :) its 3" back from where the original back box was still hidden comes down where the original outlet was. just a temp fix till i go full custom
     
  18. dannyh

    dannyh Nogaro S3

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    Really old I know but did you ever mod the back box westy??? Interested to know as I want more of a sound from my standards s3 system but don't want to spend £500
     
  19. b18shx

    b18shx New Member

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    Yeh likewise was looking to do the same on my 2001 s3?
     
  20. Danny Cawsey

    Danny Cawsey Cawsey

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    I have a 3inch downside/decat, milltek resonated centerpipe and no back box just a pipe that I welded up to replace the back box and in my opinion sounds awesome.
     
  21. daz-20vt

    daz-20vt Well-Known Member

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    And loud!!! Lol
    Drive by vids yet danny?
    Also trackday noise limits over here concern me!!
     

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