That looks pretty original apart from the cigarette lighter socket and the hazard warning lights.
There are a few bits that aren’t ideal with poor covers on wires, but apart from tidying them up I would leave that bunch if everything is working...
Ref “A”
These square warning lights normally have the function illuminated.
If you look closely you can normally see the wording.
Common warning lights are:
Choke - on petrol engines only
Park Brake - obviously handbrake warning light
Brake -...
My thoughts:
Only one cylinder sucks at a time, so having a higher volume of high pressure air (turbocharged pressure) close to the inlet valve is probably a benefit. So the two pipes and larger bore should in theory be a benefit - but just...