The best pipes I've had on my Valve to date are pictured below.
They are some rusty old Nikons.
As good as stock at low revs but rev to 10,000 instead of 9,250.
Fitted with these, some KR1 carbs, and a gutted airbox, she flies.
Some others I've tried... nowhere near as good as above.
Lomas top
Swarbrick bottom.
Some I made myself
