KW coilover suspension

So I wanted to equip my Golf 3 with a coiled suspension of KW (variant 2 or 3 ), so I wanted to ask what experiences you had with the chassis. Are there known problems or something like that??? Does anyone know if I have to do something on the fender when I first screw it to 60/40. (Do I still have the standard tyres of 185/60 R14 82T on it) Or do I need track spreads??? Does anyone know if you still get 60/40 in underground garages, or are there any problems??? Greeting Golf3