What are these things, how do they work and big improvement? I've never heard of these things before!

they're much harder than the original items and have clamps to stop the arb sliding side to side , so the bar is held in position much better

then the hole in the blocks is further forward to correct the wheel position on a lowered car

yes they do make a noticable differance to how the car drives and gives you more confidence to carry some speed into a corner

try ebay.de for the best prices "86c stabi"

FYI, they will not fit a 6n1. They are for mk2/mk2f suspension where the Anti Roll Bar also acts as a tie bar to hold the track control arm in place. It's a cheap set up and comes with its draw backs. If the ARB bushes become worn, you can get bad brake judder. These hard nylon replacements stop that from happening as well as providing a stiffer set up in general.

Thanks for clearing that up guys