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Thread: Precat mod?

  
  1. #1
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    c20let2k's Avatar
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    Precat mod?

    Gonna get a precat pipe now i think, but at my exhaust, it's not boltet in the main cat, it's a hole complete part..

    So i must weld it i guess?

    Having 2,75'' exhaust cat-back with only one back silencer, made my self..

    Woundering if it willl be more exhaust sound when getting precat pipe?
    Much performance difference?

    Thanks for answers..

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    MonkeeBoy's Avatar
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    Performance wise, when i got the precat decatted i definetly noticed a difference, it was more willing to pull from stand still and felt like it increased something in the mid range of the revs, in gears 1,2 and 3. there was some increase in 4th and 5th gear too in the same area, but it's considerably less noticable though.
    and the noise with standard ..... is quite close to standard really, a small increase in noise but you'll soon forget about it as its so small lol
    This was with a 2.5" precat.

    Not entirely sure what your asking about the exhaust, but i have only one silencer at the backbox and a straight through centre section and this is the noise it makes

    http://s151.photobucket.com/albums/s...forexhaust.flv

    http://www.youtube.com/watch?v=_XtH3sxJhf8

    Hope some of this crap i've written has helped lol
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
    Last Updated: 27/10/2014

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    Will2k1's Avatar
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    Instead of having it welded, most people fit a sports cat.

    With a pre-cat pipe the noise will increase when on boost and there is a definate increase in performance.
    Black Astra Coupe Turbo

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    BMAstra's Avatar
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    sounds like he has a one piece cat and precat thats why he is going to weld it

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    alternatively, just try and get hold of an early cat off a turbo... that way it should bolt on and you can sell yours

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    thought it was the later ones with the 2 peice cat ?

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    Quote Originally Posted by podgehog View Post
    alternatively, just try and get hold of an early cat off a turbo... that way it should bolt on and you can sell yours
    Quote Originally Posted by BMAstra View Post
    thought it was the later ones with the 2 peice cat ?
    yeah because mines the early one and it was an all in 1...one...
    >>Diary<< Status: ...........Slow and Steady.... may update more often...
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    LOCKO's Avatar
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    mines an 04 REG and it had the all in one
    so just get a vxr/gsi main cat section and it bolts straight on

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    I had an all in one pre-cat and main cat, when it snapped I fitted a standard VXR pre-cat and and courtenay sports cat. Hence why I said most fit a sports cat.

    Either way, you should be able to pick up a standard main cat for less than £50 if you wanted.
    Black Astra Coupe Turbo

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    mins an 03 and it has a 2 peice

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