Manifold de-cat

  1. Regular Poster Joined: Apr 2010 South Shields Posts: 416 Clio Campus sport Saxo VTR
    #1
    going to buy either a 4-2-1 or a 4-1 piper de-cat which will attach to my magnex cat-back system

    what are the difference between the two?

    which will show best improvement?
  2. Established Member Joined: Nov 2009 Telford Posts: 1331 EP82 Starlet GT
    #2
    Im guessing your putting this on a road car? If so then you wont notice any difference between the two really. However, the 4-2-1 gives low to mid range gains and the 4-1 gives mid to high in reality.