I like 'em and appreciate the work that goes into them, when you see them first hand they never cease to amaze. What gives me a buzz these days is things like fitting a dynojet kit to a set of four cyl carbs, mind I did myself out of a job there, I talked the owner of a local bike shop through a couple and he does them himself now. Nice guy or what.
I have designed pipes for 1,2,3,4and6 cylinder bikes, cars and sidecars. I also consult on chassis design for solos but mostly sidecars. Sidecars are in a world all of their own, a good friend races a formula2 sidecar with a 600/4 in it, you are looking at mid 120's for horsepower, and about 2G's cornering and on the brakes.
Clive W