Decat Pipes



  • Ok peeps, I know a lot of you on here have been looking for cheap alternatives for decats.

    I have a welder/mechanic friend who said he's willing to make upa bunch and sell to us on here.
    He'll make them out of mild steel, and possibly stainless (but obviously for more)

    He won't know how much he can charge until he's made one. This intial one is going to be one for my V6 and then used as a template.

    Who's up for this?

    [Also, I'm not sure if the decats on the 1.6s would be the same? I can only assume they couldn't be much different?]



  • Could he also do decats for the lenght of the MX6 headers as I am lead to believe the down pipe is longer/shorter

    I would be interested but KLZE plans tell me im wasting money as I will put the MX6 headers on and the 1.8 decat would be pointless



  • I'm sure he'd do custom lengths, but probably for a bit extra!



  • Can you do any rolling toad tests to find out if there's any gain from the pipe when it's installed? I have heard some stories of custom pipes reducing power, although it's very rare. I would be interested though if the price is right :)



  • Isit a Tig welder? if it is a might have a job for you would have serious problems with a mig doing it



  • @2442e311d9=Welly:

    Isit a Tig welder? if it is a might have a job for you would have serious problems with a mig doing it

    Well, I'm no welder, but isn't TIG more for Stainless stuff?
    All I've been told thus far is it's possible and I need to gauge interest before he starts to look into it and buy materials.

    As for gains, I have no proof, but most decats will release up to 15% power.

    Guess it depends on the car…



  • the 1.8 and 1.6 cats are different the a different thength and the flanges are at a different angle to the middle pipe



  • @1c82892769=nexussteve:

    @1c82892769=Welly:

    Isit a Tig welder? if it is a might have a job for you would have serious problems with a mig doing it

    Well, I'm no welder, but isn't TIG more for Stainless stuff?
    All I've been told thus far is it's possible and I need to gauge interest before he starts to look into it and buy materials.

    As for gains, I have no proof, but most decats will release up to 15% power.

    Guess it depends on the car…

    Tig welding is with a stick

    you can mig stainless



  • I mig welded a stainless exhaust Friday at work its fine just make sure your joins are clean, and use a decent amp welder.



  • i am interested, let us know when find out costs.etc….



  • Ok cool.

    Can we start a list please?
    I'm only gonna have a template for the V6, unless someone can help me with the 1.6?

    Gonna need at least 5 names to make it worth while methinks!

    • Nexussteve - V6


  • any chance of a full straight thru center pipe for the V6 as these are unavailable to buy anywhere except america



  • American order finishes in 2 days. If you can find it there, I can ship it back.



  • @08896df403=djmarcopolo:

    any chance of a full straight thru center pipe for the V6 as these are unavailable to buy anywhere except america

    I'll ask!



  • I am definitely interested in the de-cat, and maybe anything else to make my car more awesome! :p



  • what would you need as a template? don't suppose a pic would do it? i asume that it would not be mot freindly? want one though if it can be done.



  • MOT wise it does not matter an emission test will be carried out according to the engine age. Most cars that have de-CAT pipes fitted pass CAT emissions test, just make sure the car is very warm before the test is carried out.



  • You can also put in additives that lower your emissions for a day! ^^



  • Ok, so to sum up, these are the numbers thus far:

    -Nexussteve
    -Ash
    -DJMarcoPolo (straight through middle section)
    -Mattuhh

    Will hopefully be getting a rough quote this week, so let me know if anyone else is interested so it makes it worth his while!



  • **For reference, here's the MX-3 stock downpipe next to the stainless KL version:

    The branches are longer on the MX-3 version simply because the manifolds are shorter. When mated to the correct fanimolds, this section is the same length. You'll note that the cat-side section is markedly longer, however…

    From this image it looks like approximately 190mm longer - so you'll either need a 190mm shorter cat, or a 190mm longer mid/back section if you're going decat. I can measure more precisely later when it's not windier than God's arse outside.**


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