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Thread: exhaust system questions

  
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    bazb's Avatar
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    exhaust system questions

    Ok, Ave never did many mods to any of my cars, but am lookin to find out whats, a Pre-Cat, De-cat, Cat-Back Etc, Am lookin to get an exhaust system for my car but wnat it to be legal with as much power out it as possible without havin a really loud exhaust..

    any help guys its a mk5 1.8


    cheers
    1.8! Auto 05 MK5

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    doug2783's Avatar
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    De-cat is a piece of pipe that replaces the cat to free up some horsies but will make your car louder.
    Cat back is a exhaust system that runs from the cat back either silenced(with the centre box left in) or unsilenced depending on which will make it louder or quiteish.
    Pre-cat as far as im aware is the downpipe that runs from the manifold or on the mk5 MAY include the manifold not sure but really if your after power without being too loud a decent cat back sytem unsileced (centre box removed) should do it but its a matter of choice really. Why not try and find someone with an exhaust on a similar car and work from that??

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    Ok cheers m8
    1.8! Auto 05 MK5

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    Gazmondo's Avatar
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    Found this pic, not sure if it's of any use to you?


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    LoL, Cheers, A just didnt know what a pre-cat, de-cat, and cat-back where,
    So i take it a De-cat exhaust is illegal since it has no cat convertor, And pre-cat i take u would need to replace ur manifold as well? os is that cat-back
    1.8! Auto 05 MK5

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    pre cat = cat in manifold before it gets to the main cat
    de cat = a pipe that replaces the main cat
    cat-back = an exhaust system that goes (and sometimes encludes cat but most of the time not) from the cat right the way back to the back of the car

    IIRC you can legally get away with removing the pre cat and having a cat back system without a centre silencer but it'll be louder than a system with a centre silencer

    Hope that helps

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    Cheers Ste, Been Lookin at the Lexmual Manifold , for a little MPG and More Performance, But willl need to seek pro help before i do anythin to keep me on track, cheers Guys
    1.8! Auto 05 MK5

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