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Thread: full stainless steel

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    Regular Member dervdoc's Avatar
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    Question full stainless steel

    hello again everyone.

    want to put a full stainless steel exhaust on my 2004 2.0dti,was thinking of going for a straight pipe from the turbo (de-cat'in) to the rear end with a 'Y' piece and 2 stainless silencer's.
    i know i'll prob not have to put another exhaust system on her with fitting a stainless so thats great in the long run,and it will look nice....

    but
    -is there a big increase in bhp(anyone have prooven results?)
    -what affect will not using the CAT have, good/bad???
    -would 2 rear silencers create sufficent back pressure?
    -will she sound like a tractor or will she purr like a kitten??

    i'll be waiting on your views and reports
    cheers

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    Regular Member Danwells72's Avatar
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    de-catting a diesel is never a good idea, 1st of all failed mot, second it looses alot of vital back pressure. unless you are going to make up the pressure somewhere else but thats just pointless, like moving the cat to a differenct location. Best thing is to get a full system from turbo back using standard cat. bhp differs in width of the pipes as same with torque. best sticking to a cat-back and its cheaper

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    i ask the m-o-t about de-catting my vectra today as was told the same as the testing station

    you would never think it but you can
    but the same rule and tests will be do to the car so there is a bit of a risk of you failing the mot test on the gas test

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    Regular Member Gsi3.2's Avatar
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    errmm... there is no gas test on diesels....

    they only test for smoke emissions..... so someone is spreading the bull about....

    My father in law runs a de-catted DCI megane, and we've had no problems from that whatsoever.. the can is in place but the cat isn't inside....

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    Quote Originally Posted by Gsi3.2 View Post
    errmm... there is no gas test on diesels....

    they only test for smoke emissions..... so someone is spreading the bull about....

    My father in law runs a de-catted DCI megane, and we've had no problems from that whatsoever.. the can is in place but the cat isn't inside....
    So what's the cat for then?

    Aren't we saving the planet any more?

    Whether there's a test for it or not,it's there for a reason!

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    Regular Member Gsi3.2's Avatar
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    we are, but it's output isn't tested at the moment on diesels.. just their smoke output...

    in the future this may change thou..

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    what i mean sorry i didnt make it clear

    all the test done with the cat on will still be done with the cat off

    you will have to pass all the tests done to get your mot

    im not shore what tests are done on what car but this is what i was told

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    Quote Originally Posted by Gsi3.2 View Post
    we are, but it's output isn't tested at the moment on diesels.. just their smoke output...

    in the future this may change thou..
    Which leads me to another question.Has anyone passed an MOT test with a remap or their tuning box turned up to what they thought was running OK?

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    Quote Originally Posted by diesel dog View Post
    So what's the cat for then?

    Aren't we saving the planet any more?

    Whether there's a test for it or not,it's there for a reason!
    until the cat gets to its working temp your dont want to know about the toxic rubbish it pumps out

    and i do mean toxic

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    Quote Originally Posted by chrisgettings View Post
    until the cat gets to its working temp your dont want to know about the toxic rubbish it pumps out

    and i do mean toxic
    I've got my cheapo tuning box on My 3.0 cdti working so that I have no noticable excess smoke (get someone to follow you),but a noticable increase in power and torque,albeit probably nowhere near the claimed 226bhp or 350 lbs of torque claimed by some.I'm happy with my compromise,and maybe the planet is too.

    Back to stainless systems.Aren't diesel systems (mild steel ones compared to petrol) supposed to last longer anyway? And what sort of cost are we looking at?
    Last edited by diesel dog; 2nd January 2007 at 21:32.

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