what provides the better flow?

  1. Infrequent Poster Joined: Jun 2010 Stranraer Posts: 209 icelandic grey mk2 saxo vtr
    #1
    what provides a better flow of exhaust gasses a 4-2-1 manifold or a 4-1 manifold cheers
  2. Saxperience Post Whore Joined: May 2009 Birmingham Posts: 5801 1.1 106 XN Time, MK2 VTR 01. Ford Focus ST3 CP320
    #2
    Word on here says the 4-2-1 is better for the VTR mate. The standard is 4-1 so some people have commented that another 4-1 makes little difference. Althought it doesnt have a cat so it probably does give less restriction on the revs.
  3. Infrequent Poster Joined: Jun 2010 Stranraer Posts: 209 icelandic grey mk2 saxo vtr
    #3
    cheers dude
  4. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #4
    neither. You wont notice any real difference. Get the one that fits your car.
  5. Infrequent Poster Joined: Jun 2010 Stranraer Posts: 209 icelandic grey mk2 saxo vtr
    #5
    Is there any difference in sound compared to the standard unit?
  6. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #6
    being that you have a mk2 then you will be decatting the car. You will get an increase in sound, maybe a few pops and bangs in overrun. The car will rev far easier without a horrible cat.
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  7. Infrequent Poster Joined: Jun 2010 Stranraer Posts: 209 icelandic grey mk2 saxo vtr
    #7
    Top stuff thanks for the info
  8. Established Member Joined: Apr 2009 Redcar Posts: 1971 2000 Posi Blue vtr
    #8
    4-2-1 Traditionaly give more power low and mid range, most factory systems are like this. 4-1 manifold will move and improve power further up the rev range. Again, as with all tuning mods, there is trade off. 4-2-1 better for street driving but a 4-1 would be better for the track were the engine is being worked hard all the time.
    Only aftermarket manifold I ever had was on my old '85 Xr3i and it definately was a marked improvement over the original one.
  9. Infrequent Poster Joined: May 2011 Posts: 110
    #9
    personally i would say 4-2-1 and go stainless not mild steel.
  10. Saxperience Addict Joined: Nov 2006 A farm shed in Aylesbury Posts: 14916 Corolla AE86 Peugeot 205 B18C (in bits)
    #10
    Quote:
    Originally Posted by Stevo123 View Post
    4-2-1 Traditionaly give more power low and mid range, most factory systems are like this. 4-1 manifold will move and improve power further up the rev range. Again, as with all tuning mods, there is trade off. 4-2-1 better for street driving but a 4-1 would be better for the track were the engine is being worked hard all the time.
    Only aftermarket manifold I ever had was on my old '85 Xr3i and it definately was a marked improvement over the original one.
    Treat it as a theory only. Your road spec engines are hardly optimised.
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