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bypass for cats 1.8 t

Discussion in 'A3/S3 Forum (8L Chassis)' started by norfolkaudi, May 7, 2012.

  1. norfolkaudi
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    norfolkaudi Member

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    [May 7, 2012]
    hi all

    been look around at sites and came across exhaust cut outs. would it be possible to use a cut
    out before the cat and and run a bypass pipe past the cat and back to the main exit pipe.

    saving time & money on de-cats or sports cats, would it still pass an m.o.t as the bypass can be closed

    to run the cat, these seam very popular in the states.

    has anyone done the same here in the uk ?????

    here is a link New and Improved electric cut-outs are now available

    Doug's Headers Electric Exhaust Cut-Out Kit - 2.5" - Exhaust - American Car Parts - Car Parts
    Last edited: May 7, 2012
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  3. Inertiauk
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    Inertiauk Member

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    [May 7, 2012]
    Thats interesting, but a lenient MOT tester is a much tidier solution. ;-)
    #2
  4. sportstractor
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    sportstractor Chugger

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    [May 7, 2012]
    nah wouldnt consider it far too much going on, could be problematic and not enough gain too be had for the amount of work, you can always find a tester who wont mind overlooking a decat
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  5. hades-
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    hades- Yorkshire & Humber Rep. Regional Rep VCDS Map User

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    [May 7, 2012]
    why would you think they bypass the cat ?
    they are normal used to make the car louder that just wouldnt work to bypass a cat
    it wouldnt save time of money
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  6. sportstractor
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    sportstractor Chugger

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    [May 7, 2012]
    it would bez, doesnt show it but its to be used with a exhaust Y section. Your thinking of an EX-UP valve
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  7. norfolkaudi
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    norfolkaudi Member

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    [May 7, 2012]
    yes sportstractor you are right you would have to use a y section before the cat with the bypass mounted
    in the line to the cat just after the y section, i think will ahve to make some pics up to explain tomorrow.

    norfolkaudi
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