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  • 3 weeks later...
  • EVIL T
  • Member
  • Member For: 16y 6m 5d
  • Gender: Male
  • Location: Liverpool NSW

single 3.5" will outflow the 2 x 2.5", even though the cross sectional area is almost equivalent

reason being the circumfrence of the single 3.5" is

(3.1415 x 3.5 x 25.4)= 279mm

and the circumfrence of the dual 2.5" is

2 x (3.1415 x 2.5 x 25.4) = 398mm

therefore there is 40% more surface area in the dual system, which will create more drag....

as far as what effects it has on power figures, who knows.... but it will flow more freely

Edited by FAST-XR
  • Donating Members
  • Member For: 21y 9m 10d
  • Gender: Male
  • Location: Townsville

Haven't had a problem with my single 3.5in on the BA and I live in flood territory so I wouldn't worry about it.

Maybe whoever told you that has the mild steel in stock only!

  • 4 weeks later...
  • Member
  • Member For: 17y 16d

I have a 4" dumpy and 3.5" xforce system in my car and it sounds like a jet.... no drone at all on the highway really happy with it :) when u change gears it makes this cool " doooo " sound too haha almost like a turbo diesel truck , but not as noticable.

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