I just installed this kit on my '92 SPi: http://www.minisport...mini-sport.html
I suspect it pretty much contains the same set of hilos. Have no complaints so far.
As for the ride height I adjusted it to the lowest that I still felt was safe and with new cones it was standing quite proud. Running on 13" 175/50 wheels.
Right after installing: http://www.miniklubi...ile.php?id=1358
It has settled a fair bit within a few hundred kilometers, I can maybe get three fingers between the arch and the wheel right now. And as the cones settle more I need to go higher anyways - and there's plenty of thread to go that way - so I'm happy. And there is some thread to go down, this is what I settled on.
Can't really comment on how much lower you can go when coming from non-adjustable units, had hilos before this kit as well, but at least you can see what happens on 13" wheels with Minisport hilos and fresh cones.