The very short story of one of few? MKII Syncro GTI 16Vs
From I was about 20 and ten years on my project off and on was Syncro 1,8 that was converted to a 1,8 GTI16V and later again to Megasquirt EFI.
And resprayed it in Rolls Royce Flame Orange of course.
Cause why wouldn't you, everyone need a Orange kustom car in their life
In case you were asking, yes the water tap is the idle controller
Aeromotive fuelcontroller and Edis4 ignition box.
Never finished the project but sold it to some guy who lost his licence two weeks later and the sold it on to I do not know where. Most likely in a scrapyard now.