39.6 inlet, 34mm chokes for twin 40's, I could go 36, although not sure thats strictly speaking legal, but everyone else cheats much worse!
34.5 ex, although I rarely bother worrying about ex side, it looks after itself to a large extent
position is restricted . . .ie I can't go downdraught, I tend to port up the head face as much as I can to straight line the inlet if you like, its negligible but every little helps !
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