Hi Phil,

Thanks for that. I think my carb guy has already sourced air horns, but your advice on the vent holes above the horns is very timely.

I'm in Australia, so if it's custom made, I'll chase someone down here to make a box (or do it myself) because the chances of something being perfect first time seems remote, and freight back to the US/Australia a few times will be prohibitive.

Kevlar is an interesting choice - what made that the material of choice? Weight? Strength? I had thought of doing it in aluminium or fibreglass. I had also thought of using flex tube to the front to cope with engine rocking. Doesn't your rigid tube cause any problems? And 3" sounds huge - especially compare with the original little tube the 142s had to feed the strombergs. The bigger tube sounds like a very good idea, but I do think flex tube has advantages, or do the concertinas muck up the airflow too much?

regards

John