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Author Topic: Exhaust from Cat backwards purchase advice  (Read 3795 times)

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Webby the Bear

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Exhaust from Cat backwards purchase advice
« on: 12 January 2014, 11:40:17 »
Hi guys, how are ya? :)

Ok, got pay day coming up in a couple of weeks and I'm fed up with using repair paste on my exhaust  ::) so I'm going to replace.

Looking at my exhaust it's all in a shoddy state :( so after speaking to Martin yesterday we discussed just replacing the whole thing from Cat backwards. I'm not opposed to that due to the state of it.

Forgive the really stupid question but if I buy a ''cat back'' will I be getting everything from the green arrows back to the back-box? I presume so but worth asking for clarity :)


I've done a search on here and the only advice on what parts to buy is to go stainless steel. That's fine but being a student I'm pretty broke at the moment so looking for a bi of a compromise in this area. Can anyone recommend a decent budget exhaust system?

Also I've noticed a bloody great hole next to where the O2 sensor lives on the downpipe.... can the downpipe be purchased separately?

Re fitting I'm thinking that as I'm replacing everything cat backwards then I simply undo the exhaust from the cats and remove off the hangers, then drag it out as all one piece?

And on refitting get it on the hangers then do it up to the cats?

Any advice you can give me would be brill! :)

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YZ250

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Re: Exhaust from Cat backwards purchase advice
« Reply #1 on: 12 January 2014, 11:49:06 »
Yes, cat back system is from the "two bolt flange" backwards, so your assumption is correct. It's worth soaking those bolts in plus gas a few days earlier as the thread is in one half of the coupling flange. If they shear off, you will have to drill them out and use nut and bolt method.  :y
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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #2 on: 12 January 2014, 11:51:37 »
Thanks mate :)

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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #3 on: 12 January 2014, 11:56:18 »
just had a thought.... does the down pipe include the cat? Or is the cat separate?
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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #4 on: 12 January 2014, 12:00:58 »
PPS, found this....

http://www.ebay.co.uk/itm/Opel-Vauxhall-Omega-B-2-5-2-6-V6-Estate-Silencer-Exhaust-System-352-/261111236317

Rubbish or any good? Or would I have to suck it and see? :)
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Re: Exhaust from Cat backwards purchase advice
« Reply #5 on: 12 January 2014, 12:02:26 »
Forgot to say, cosmetically speaking it's worth putting a 3.0 system on it as it will hang in all the same places.  :y

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hotel21

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Re: Exhaust from Cat backwards purchase advice
« Reply #6 on: 12 January 2014, 13:26:10 »
I bought the one in your eBay link for my 3.2 estate around septembertime. Only needed the two centre sections as car has an irmsher back box but worth buying whole thing. Well enough made, fitted where it should, and mated to irmy box no problem.

But had to drill 3 of the 4 bolts out. The other one was drilled out by me a few years ago when I replaced exhaust time before.

System noise is acceptable and no knocks or rattles. Sits high under the car which is good as car is also lowered somewhat!

And I haggled a bit with the seller by submitting a best price offer. Wasn't much but even a tenner is a tenner to a student!   :y
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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #7 on: 12 January 2014, 13:39:51 »
Quote from: hotel21 on 12 January 2014, 13:26:10
I bought the one in your eBay link for my 3.2 estate around septembertime. Only needed the two centre sections as car has an irmsher back box but worth buying whole thing. Well enough made, fitted where it should, and mated to irmy box no problem.

But had to drill 3 of the 4 bolts out. The other one was drilled out by me a few years ago when I replaced exhaust time before.

System noise is acceptable and no knocks or rattles. Sits high under the car which is good as car is also lowered somewhat!

And I haggled a bit with the seller by submitting a best price offer. Wasn't much but even a tenner is a tenner to a student!   :y

Awesome, cheers H21!  :y

Re the bolts.... is that cos they were rusted in place? Do I need any replacement bolts and gaskets?  :) Re bolts if they come out I was simply going to clean the threads up and put a bit of oil on the threads and re-use them.
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Nick W

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Re: Exhaust from Cat backwards purchase advice
« Reply #8 on: 12 January 2014, 13:41:02 »
I've an almost new, complete cat back system from a 3.0l saloon. It was part of the job lot of bits that came with my project engine, and is of no use for my estate.

Webby, it's yours if you care to collect it.

Nick
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05omegav6

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Re: Exhaust from Cat backwards purchase advice
« Reply #9 on: 12 January 2014, 13:50:51 »
Can't say fairer than that :y
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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #10 on: 12 January 2014, 14:21:01 »
PM sent Nick, thanks very very much!!!!
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martin42

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Re: Exhaust from Cat backwards purchase advice
« Reply #11 on: 12 January 2014, 15:25:29 »
Bolts on passenger side are ok as we had them off to refit downpipe when doing heads,when you get exhaust pop over to mine and fit it here :y
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Keith ABS

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Re: Exhaust from Cat backwards purchase advice
« Reply #12 on: 12 January 2014, 15:40:23 »
  With referance to using stainless steel system, was there a system in the ads just this week?
keith B
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Webby the Bear

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Re: Exhaust from Cat backwards purchase advice
« Reply #13 on: 12 January 2014, 15:50:55 »
Quote from: The Mad mechanic on 12 January 2014, 15:25:29
Bolts on passenger side are ok as we had them off to refit downpipe when doing heads,when you get exhaust pop over to mine and fit it here :y

You sure that's ok, Martin? Thanks mate very kind!!!  :) :) :) :)

I couldn't remember if we'd took them off but now I recall we had to get them off to manouvere the downpipe in to place :)
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chrisgixer

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Re: Exhaust from Cat backwards purchase advice
« Reply #14 on: 12 January 2014, 16:02:27 »
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