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  • I <3 Floods
  • Silver Donating Members
  • Member For: 13y 9m 11d
  • Gender: Male
  • Location: South West QLD

Depends.. What's your Dump and Cat combo? And other supporting mods?

If the exhaust was the reason your tune stopped at 310 then definitely.. But I've probably recommend the 4"..

However if the injectors were what stopped it going beyond 310 then that's where you need to look first..

  • Three pedals are better then two..
  • Donating Members
  • Member For: 17y 11m 16d
  • Gender: Male
  • Location: Melbourne

Don't think twins help performance, if anything they are more restrictive.

  • I <3 Floods
  • Silver Donating Members
  • Member For: 13y 9m 11d
  • Gender: Male
  • Location: South West QLD

Search the thread about cross sectional area of the different sizes and make your decision based around what performance you are aiming for.. Twins are really only good for ground clearance though.. If you calculated pipe flow the extra pipe wall would actually be more of a restriction.. Also remember that any exhaust can go to twin tips at the rear muffler.

  • 2 months later...
  • Donating Members
  • Member For: 14y 7m 22d

I have got Twin 2.5 inch, 4 inch dump and high flow 5" cat and I am making 400KW on 18lb on 98, be good for more if I ditched the standard intake. Dont know how much of a restriction it is but its quiet enough not to get me in trouble frquently

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