Pete, that bypass hose.. was MUCH easier if you abandoned the original equipment concertina hose and just used heater hose. And worm-drive clips.

I was buying a new battery (again) for the van, asked the electrician about spark-plugs for my V6 Camry (you have to remove the intake trunking, hence long-life plugs,) and he said " come and look at this, then. 'This' was a beautiful newish Aston-Martin. To change plugs on this is a most-of-the-day job, because ALL the plugs are buried under machinery. Approaching NZ$2000 to change the plugs.
Rich man's toy.
It really is beautiful, though.