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Center box removal

Discussion in 'A4/S4 forum(B5 Chassis)' started by gaz71, Feb 26, 2010.

  1. gaz71
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    gaz71 1.8T Quattro Sport AJL

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    [Feb 26, 2010]
    If I was to replace my center box with straight pipe would it still pass MOT?
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  3. jcb
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    jcb Active Member VCDS Map User

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    [Feb 26, 2010]
    don't see why not. some milltek aftermarket ones are rear boxed only.
    so long as it is not above a certain level at idle and doesn't leak
    #2
  4. gaz71
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    gaz71 1.8T Quattro Sport AJL

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    [Feb 26, 2010]
    Coolio. What do you reckon it'll sound like with standard rear box. Want to free up flow mainly, but a little extra vroom wouldn't be a bad thing :)
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  5. Geeman
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    Geeman Low Life

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    [Feb 26, 2010]
    Mine doesn't have a centre box. Passed it's MOT fine.
    #4
  6. Davy
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    Davy New Member

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    [Feb 26, 2010]
    Straight through pipe on mine also, passes MOT fine :)
    #5
  7. jcb
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    jcb Active Member VCDS Map User

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    [Feb 26, 2010]
    its not the silencer that casues the majority of the restriction, its teh 2.25" bend in the front pipes, can't harm it though.

    might get a bit of a drone on the motorway
    #6
  8. gaz71
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    gaz71 1.8T Quattro Sport AJL

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    [Feb 26, 2010]
    Right, well that's the plan then. Just have to get a piece made up and fit it.

    Nothing wrong with a bit of a drone, will drown out the missus :undwech:
    #7
  9. stub
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    stub the matrix is comin

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    [Feb 27, 2010]
    hi gaz mine is minus the center box. passed no probs mate. sound wise well i've been told it sounds like a s4 now. its not load in the car but get the revs rite when slowing down you can get a pop from the back of the car. defo one of the best things i've done. lol
    #8
  10. Oranoco
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    Oranoco Well-Known Member

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    [Feb 27, 2010]
    Had my centre box removed. Nice burble now and it cost me £150 to have done. £40 for PowerFlow to make a mess of it and NOT do it as per my instruction and £110 to get a new flexisection welded up elsewhere as I wasn't going to let those clowns at the car a second time.

    Oh yes passed the MOT with no bother at all
    #9
  11. AB5QTS
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    AB5QTS Member

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    [Feb 27, 2010]
    Mine TQS has a Milltek cat back non-res. I think it sounds great especially above 3 and halk K. The drone can get tiresome on a long journey and if there is any longish hills around where you're doing 60-70mph it is loud. Mine pops on down shift too and if I get it above 5K revs especially 2nd to 3rd and 3rd to 4th I can feel it WHOOMP on the change. Can only just hear it as it is quite loud in the cabin by this stage. MOT's no probs. Do it......:thumbsup:
    #10
  12. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator VCDS Map User

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    [Feb 27, 2010]
    i'm very surprised you'd be getting any popping on overrun with a cat fitted...

    It usually occurs at high revs because the management often continues injecting fuel to help cool the pistons, but with a cat fitted, the excess fuel usually simply burns off inside it, and it acts like a flametrap.
    #11
  13. jcb
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    jcb Active Member VCDS Map User

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    [Feb 27, 2010]
    I have a milltek too, I like the sound, not too chavvy. Love the downshift burble/pop!
    motorways are a bit drony but that is what the stereo is for
    #12
  14. Geeman
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    Geeman Low Life

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    [Feb 27, 2010]
    I have a (supposedly ****, but I love it) Powerflow system on mine, with the middle box deleted. It's not loud at all. In fact, I was dissapointed at how quiet it was.

    But, on hindsight, I would probably have got bored with it if it was boomy/loud/droney... so I'm happy.

    And... this morning I've just had my old tailpipe changed from a rounded letterbox style end (that filled the bumper cut-out perfectly) to a more traditional twin round outward rolled design. Looks much better now. Very happy!
    #13
  15. AB5QTS
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    AB5QTS Member

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    [Feb 27, 2010]
    I'm no mechanic but mine definately does the pop and sometimes if I've been a very naughty boy it might even go pop pop pop. I do enjoy the upshift whoomp :yum:
    #14

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