Yes it will make a difference on anything with a round slide carb, I also do thid mod with venturi dividers with the UFO this makes better response and a much more linear power

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there it is

A banshee UFO is too small they are for 26mm , On the 28mm I cut down a UFO for a 32 mm
 

Racerclam

Just took a look at your website - lots of interesting stuff on there, clearly you know your stuff.

Never come across venturi dividers before, unlike UFOs which I have seen / heard a lot about.

If a UFO would make a noticeable difference to my stock DT then it sounds like it is worth thinking about.

Thanks.