Difference between decat manifold and catted manifold?

  1. Established Member Joined: Feb 2011 Posts: 1385
    #1
    I know obviously one has cat and one has not, But what sort of performance would be gained between the two? Thinking of getting a 4-1 with sports cat but not sure.
  2. Saxperience Hardcore! Joined: Nov 2007 Guantanamo Bay Posts: 28700 oyster card
    #2
    They usually say about 5bhp..

    Its worth de-catting for the feel of the change not just for chasing bhp fingures.
  3. Established Member Joined: Feb 2011 Posts: 1385
    #3
    Quote:
    Originally Posted by db_sax View Post
    They usually say about 5bhp..

    Its worth de-catting for the feel of the change not just for chasing bhp fingures.
    Is that 5bhp with de cat manifold or catted manifold?

    Oh not bothered about chasing bhp figures its only a vtr lol. Just to see if a de cat manifold would be a bigger difference i would get it as its a lot cheaper!
  4. Frequent Poster Joined: May 2011 Bradford on Avon,Nr Bath Posts: 866 '01 astra coupe
    #4
    I changed saxo_gray's with him last week or week before, and it ha made a big difference to the feel or the car when driving (engine seems to be less restrictive than before), don't know if there's much change bhp wise (1.4 westcoast)
  5. Established Member Joined: Sep 2007 Swadlincote Posts: 1185 2003 Black VTR
    #5
    I just fitted a Piper 4-1 decat manifold, car feels a little more responsive now but its really the noise which has improved most, sounds alot more tinny and raspy, and when you start the car you can hear it scavenge fuel with the exhaust
  6. Saxperience Hardcore! Joined: Oct 2008 Birtley Posts: 22253 VTR Turbo, 106 xsi track slag, Transit recovery, B
    #6
    the may rev a little more freely, may feel a little more responsive, not noticeable on majority of stock engines, does sound alot better though