exhaust question

  1. Regular Poster Joined: Apr 2009 Leicster Posts: 352 cammed vts :P
    #1
    right, i was looking under my car today and realized it has no silencers or cat, apart from the back box, so all it is, is a 4-2-1 downpipe then a midpipe to the back and a back box, would my car run better with an xtra box to keep the back pressure up, the exhaust isnt very noise, and it revs up and down normally. do you recon its the best set up keeping it like this as the car is cammed etc? or would it be better with an xtra box? thanks
  2. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #2
    it will be fine. Might have a supersprint centre section on there or something
  3. Saxperience Forum Bum Joined: Aug 2006 Sunbury On Thames, Surrey Posts: 2593 I like Bikes now 👍🏻
    #3
    keep it as it is. you have un restricted airflow in the exhaust so its pretty much as good as it gets
  4. Saxperience Forum Bum Joined: Jan 2008 Down't road from Sheffield Posts: 4641 Was:16v 106 XS ..... Now: Import 1.8 MX5
    #4
    I went from an exhaust with no silencers, except the backbox, to a system with a centre silencer and noticed a massive increase in torque.

    All to do with pulse tuning and increasing the back pressure (N/A engines rely on some amount of back pressure), I believe.