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Thread: Exhaust de-cat

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    Exhaust de-cat

    Ok as most of you will know my 850 is being treated with a jamest5r style budget, with mainly secondhand components and cheap and effective modifications.

    I was wondering whether removing the cat on the standard "suitcase" exhaust would be worthwhile.

    Im assuming you just cut it out with a grinder then weld or clamp in a new pipe.

    Has anyone done this before? Is it worthwhile for the sake of the cost of a piece of pipe?
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    By removing the cat you are basically removing a restriction in the exhaust system so yes it is a worthwhile 'free' mod. It will of course be a likely issue if the car is to be used on the road at mot time.
    Old Car: 855 T5 in Grey and rust (dead and gone, well, most of it !
    Missus' ride: Citroen C4 coupe 1.6 HDi,
    Modifications: Nowt.....yet !
    Daily driver: 855 R in Black,
    Currently nursing a blown head gasket, new engine on its way !
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    Quote Originally Posted by nobananas View Post
    By removing the cat you are basically removing a restriction in the exhaust system so yes it is a worthwhile 'free' mod. It will of course be a likely issue if the car is to be used on the road at mot time.
    Thanks, the MOT front is covered so im not massively worried about that.

    Do you know what type of metal is used to make the standard exhausts? Is it aluminium?
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    Just mild steel mate, mig weld it in !
    Old Car: 855 T5 in Grey and rust (dead and gone, well, most of it !
    Missus' ride: Citroen C4 coupe 1.6 HDi,
    Modifications: Nowt.....yet !
    Daily driver: 855 R in Black,
    Currently nursing a blown head gasket, new engine on its way !
    Recent addition: Freshly imported Honda Stepwagon,
    Slowly turning into a camper van !

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    The Flying Moose (Friday 5th November 2010)

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    Quote Originally Posted by nobananas View Post
    Just mild steel mate, mig weld it in !
    Time to do some measuring....!

    Just need to find somebody with welding equipment now as I no longer have a welder.
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    Quote Originally Posted by V70ETS View Post
    Ok as most of you will know my 850 is being treated with a jamest5r style budget, with mainly secondhand components and cheap and effective modifications.

    I was wondering whether removing the cat on the standard "suitcase" exhaust would be worthwhile.

    Im assuming you just cut it out with a grinder then weld or clamp in a new pipe.

    Has anyone done this before? Is it worthwhile for the sake of the cost of a piece of pipe?
    Cheeky git lol, when i have a forged block and t35 next spring ill sell you my 18t just to keep my costs down lol.

    What you want to do is get the cat cut out and a straight pipe welded in should cost about 50quid ish unless you can find a welder to borrow, well worth doing as the cat is very restrictive, then get a cat back system or cut the suitcate out of yours and get something smaller in place.


    T35, 556Nm/410lbft & 361BHP/317WHP

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    The Flying Moose (Friday 5th November 2010)

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    Quote Originally Posted by jamest5r View Post
    Cheeky git lol, when i have a forged block and t35 next spring ill sell you my 18t just to keep my costs down lol.

    What you want to do is get the cat cut out and a straight pipe welded in should cost about 50quid ish unless you can find a welder to borrow, well worth doing as the cat is very restrictive, then get a cat back system or cut the suitcate out of yours and get something smaller in place.
    Sorry lol

    No offense meant.... you said it yourself many time mate!

    Sure ill buy it off you when your done with it, let me know

    So you think an exhaust place will do it for me for £50? If so awesome can get that for the cat if I were to sell it.
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    has any 1 took the big sliencer out aswell as the cat on the standard exhaust

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    Quote Originally Posted by V70ETS View Post
    Sorry lol

    No offense meant.... you said it yourself many time mate!

    Sure ill buy it off you when your done with it, let me know

    So you think an exhaust place will do it for me for £50? If so awesome can get that for the cat if I were to sell it.
    None taken mate, i went to a small inderpendent and he cut the cat out and welded a piece in for £50, sounded lovely when i first started it, but if you have the money get them to do a cat back system its worth it and could get it done for about £250, saves you going back and having it done at a later date then youve wasted £50.


    T35, 556Nm/410lbft & 361BHP/317WHP

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    Quote Originally Posted by jamest5r View Post
    None taken mate, i went to a small inderpendent and he cut the cat out and welded a piece in for £50, sounded lovely when i first started it, but if you have the money get them to do a cat back system its worth it and could get it done for about £250, saves you going back and having it done at a later date then youve wasted £50.
    Thank god for that, I read what I posted then thought "oh dear that could be taken the wrong way".

    I need to find an indepandant willing to do it then. I was going to get a full system done or purchase an OBX from the states but as I am supposed to be collecting a T5R interior and a T5R bumper in the next fortnight I cant afford it.
    Arguing is pointless....she may not be right but she's never wrong

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    a 19t just isn't laggy enough
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    sorry for the confusion Emlyn, when i BT was on here 15g i had Powerflow de-cat her for me (i just don't do my own work on exhausts). Weather's not looking too bad so more than welcome to pop over if you want & we'll go round & see what they say, think they charged me £30

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    i had my 850R done made it alot more responsive and sounded brill think it was about 50 quid ish from ets in notts

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    Quote Originally Posted by V70ETS View Post
    Time to do some measuring....!

    Just need to find somebody with welding equipment now as I no longer have a welder.
    Hi mate. If you're at Marham, go and see the boys in Station Workshops, in GEF. They are a good bunch and should be able to advise/help.

    Woody.
    Owned since 2002. '96 Green 855-R, Manual M56H conversion by Russ @ RT Mech, 82mm rebore, THS Rods, Wiseco Piston kit, Decked Block, Machine work was completed by: www.mandjltd.co.uk, Refurbed head inc skim & 8 new valves, ME7 Ex Manifold, RICA304, Forge Blanking plate, 302mm set-up, PowerFlex Top & Bottom, Front Strut Brace, Miltek Cat-Back, R.I.P, IPD Cone Filter.

    Latest update: 10000 miles as at 19/05/13.

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    remember at MOT time though you will need your cat back in

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    Quote Originally Posted by leighkaicraigmia View Post
    remember at MOT time though you will need your cat back in
    i know of a few that have passed ok

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    Ive got a 100 cel race cat on myne and that only just passes and before i out that on and had the standard cat on the car hardly registered on the emmisions so its very doubtfull but as pedro has said ive also hear of people saying theres went through

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    Well I went to pfandango's today to help him with some work on BT and ended up taking a trip to powerflow.... £50 later I have a stainless steel pipe in place of the cat and a brand new rear hanger for free as the old one was bodged and knackered.

    As for MOT... its sorted

    Thanks for the suggestion james... would never have even tried if you had not suggested it!

    pedro has a video somewhere of the car while there was no cat or pipe in place. It was very loud!

    All I can say is wow! Really makes a noticable difference in the responsiveness without a doubt and it has a nice exhaust tone now despite still having the "suitcase" in place.







    Last edited by The Flying Moose; Saturday 6th November 2010 at 21:19.
    Arguing is pointless....she may not be right but she's never wrong

    Tell her a remap is just having your satnav updated.....

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    Well I went to pfandango's today to help him with some work on BT and ended up taking a trip to powerflow.... £50 later I have a stainless steel pipe in place of the cat and a brand new rear hanger for free as the old one was bodged and knackered.

    As for MOT... its sorted

    Thanks for the suggestion james... would never have even tried if you had not suggested it!

    pedro has a video somewhere of the car while there was no cat or pipe in place. It was very loud!

    All I can say is wow! Really makes a noticable difference in the responsiveness without a doubt and it has a nice exhaust tone now despite still having the "suitcase" in place.







    Last edited by The Flying Moose; Saturday 6th November 2010 at 21:37.
    Arguing is pointless....she may not be right but she's never wrong

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    Quote Originally Posted by V70ETS View Post
    All I can say is wow! Really makes a noticable difference in the responsiveness without a doubt and it has a nice exhaust tone now despite still having the "suitcase" in place.
    I found that with mine, it was well worth doing




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    already uploaded & awaiting clearance from you lol

    [ame]http://www.youtube.com/watch?v=lEkJnMJNovk[/ame]

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