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Thread: Pre-Cat pipe, DIY or Pro job?

  
  1. #1
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    Pre-Cat pipe, DIY or Pro job?

    Well went down to regal today for a power pipe and air hose kit which i got but whilst i was waiting for the guy to grab them i spotted the pre cat pipe and thought oh what the hell so bought one!

    I had a very quick look at it and the standard jobby and it looks resonably accessable but is it s DIY job or is it best to get it done by a pro?

    Also its gonna go on with the following:

    K&N panel filter
    Veccy C pipe
    Iridium Spark Plugs
    power pipe

    now im not asking for how much BHP il gain as it will be minimal but what i do want to know is if i will notice a smoother acceleration or better pick up etc!

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    Mark_W's Avatar
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    I fitted mine and the 200cell cat on axel stands with the help of a mate. we just put up the front of the car and had enough room

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    astracoupeboy's Avatar
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    how long did it take you?
    fly like a bird in water, swim like a fish in the sky, & if U wanna get high, then clime a ladder, if U wanna get low, go underground.
    231Bhp/269ftlb

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    888rich's Avatar
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    yes its diy do-able, getting the clamp back around the pre cat and turbo is a pain - i had a 2nd person hold it in place from under the car so it was quite easy - 40 mins to do that, the sports cat, and exhaust system

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    As above. Easy as a DIY job. Handy if there's 2 of you though, otherwise the clamp can be a pin though.

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    Depends, not so easy on the early coupes with the one piece pipe as it needs cut and welded iirc.
    Previous Astras: 1994 Cesaro 1.8 16v | 2002 SXi 1.6 16v | 2001 Coupé 2.0 Turbo | 1999 LS 1.6 16v
    Other Vauxhalls: 2001 Vectra 1.8 16v| 2003 Vectra GSi 3.2 V6 | 2005 Signum CDTi 150

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    yeah as above - pre 2002 coupes had a one piece cat so it wont be a simple bolt on bolt off job - either a sports cat or a welding job (bodge job as i like to call them)

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    astracoupeboy's Avatar
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    i've got a 51 plate with a milltek cat back, can i not get a pre-cat and then later get a 200 cell hi flow mid-section?
    fly like a bird in water, swim like a fish in the sky, & if U wanna get high, then clime a ladder, if U wanna get low, go underground.
    231Bhp/269ftlb

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    The chances are that you will have a one Piece precat and main cat assembly, 2002 cars onwards had the separate items that can be unbolted and replaced individually. You may need to have to cut the precat off, and have a flange welded on the remaining main cat section to allow you to fit it, so in that repect, it aint an easy job. Take a peek under the car from the front, and see if you can see the flange, if yes then all is well, but failing that, its a pain in the arse.
    Astra GSi Turbo, SOLD


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    you could but you will have to weld the pre cat to the existing one - then when u get a sports cat somehow bodge it all togeather again - imo get the sports cat and fit them both at the same time

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