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Thread: Performance Pre Cat pipe

  1. #1
    Regular Member Stuarty's Avatar
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    Default Performance Pre Cat pipe

    Have googled it for the veccy but with no joy found some info on the astra owners club but couldnt find out who makes them and if they would work with the vectra exhaust so does anyone have one fitted if so how much and where from?Also is it a fairly easy mod to do and what kind of power gains are to be had?

    Thanks in advance guys.

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    Regular Member rushy's Avatar
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    Dont know how the CDTI is set up but my cat is basically the collector for the manifold so is right in front of the bulkhead instead of under the car. Nothing can be done except new custom manifold and aftermarket cat.

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    Full Member merikiito's Avatar
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    Had mine removed from mine and passes MOT no problems. Unfortunatly with all the issues going on with my car at the moment I cannot tell u about any power increases. Once all is sorted its going to get remapped so will see then. Seems to drive smoother tho and no turbo lag

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    Regular Member nutron's Avatar
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    The first CAT forms the down pipe from the turbo and clamps straight onto the turbo output. You will have to remove or at least undo the heat shield to get the first CAT off. You then have two options, firstly you could have a new pipe made up to fit. Alternativly and a much cheaper option is to cut the original CAT in half, gut it and have it carefully welded back together (make sure it is correctly aligned or it won't fit back). Then just wake the old down pipe back in and it will look like you haven't touched it. I went for the latter option and would recommend it for cost and appearance (i.e. doesn't look modified).

    As for changes in performance, maybe it does but I can't say yes or no for sure.

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    I have a Magnex one on the Astra. Fitting is a monsterous job on the Astra - you literally have to take the whole front off the car, slam panel and crash bumper included. We just managed to get the rads moved without draining the coolant.

    It's some job, really gets rid of turbo lag, and gives a lot more torque before the turbo kicks in.

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    Regular Member woody in shetland's Avatar
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    Hi guys,
    Just my suggestion, could be cr*p but here goes. Hows about picking up a second hand one from a breakers if you can get one and take a thin rod and bash the inside's out at least you'd still have your original if it didn't pass an mot. Just an idea
    cheers Woody

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    Regular Member Stuarty's Avatar
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    Hmm sounds like a bit of a ball ache may just get a BSR first and see how i get on with that before i start messing with exhausts.

    Cheers for the input guys

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    Regular Member nutron's Avatar
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    It's virtually impossible to just bash out the internals due to the complex shape of the pipe. As I said, the first CAT is effectively the down pipe from the turbo and also holds the Lamba sensor, the pipe is bulged in the middle for the CAT material but has small entrance and exits, it is also curved heavily. Chopping the pipe in half is the best option but be aware that there is a heat shield around it too.

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