de-cats or not???

  1. Infrequent Poster Joined: Dec 2007 Consett, Co. durham Posts: 206 Mk2 vtr...
    #1
    When my sax finally rolls out the bodyshop im thinkin of de-cating it, but will this affect the m.o.t, ive got a piper 4 branch and magnex back box, but the cat and centre still in? Any advice...
  2. Established Member Joined: Dec 2006 Posts: 1280
    #2
    might pass mot without cat but cant say for sure, you need to get a gas test after you decat it to know for sure
  3. Established Member Joined: Jun 2007 Toronto, Canada Posts: 1118 Mitsi Evo 2008
    #3
    having a de-cat will fail your MOT especially if you put on a straight through pipe as emission tests a getting tougher to pass.
    But you can always put it on and replace cat when MOT due.
    Or you could put on a sports cat as some garages will pass it with these on as the do roughly the same job as a cat but just free up the gasses a bit more than your standard cat.
  4. Saxperience Forum Bum Joined: Feb 2007 Portsmouth Posts: 2882 54 Audi A4 Estate 1.9TDi
    #4
    Quote:
    Originally Posted by mutley View Post
    When my sax finally rolls out the bodyshop im thinkin of de-cating it, but will this affect the m.o.t, ive got a piper 4 branch and magnex back box, but the cat and centre still in? Any advice...
    yes it will affect mot, but there is a button on here mate called search, use it. Btw are you charmillionaire "They see me rolling they hating"
  5. Saxperience Post Whore Joined: Apr 2007 Haywards Heath Posts: 8445
    #5
    Quote:
    Originally Posted by VTS_Pjsaunders06 View Post
    yes it will affect mot, but there is a button on here mate called search, use it. Btw are you charmillionaire "They see me rolling they hating"
    haha loving the posts today

    Keep it on until after the MOT then you can do what you want for another year
  6. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #6
    if the cat is in the manifold then just get a cat back centre section. You won't gain masses of extra power by removing the existing one and sports cats are pricey.

    for maximum performance a straight through race system is the best bet* .. but if you just want something that sounds good and aren't squeezing ever last bhp out and don't want the hassle of changing every year then cat back setup is good enough.


    *my personal fav