You can indeed have 18s on your valver. But if it genuinely is a 60mm drop youll be chopping a hell of a lot of your wing out to get the wheels to even turn. On a 35mm drop I had to take quite a lot out of the arches so 60mm would be a real mission. And thats only on the absolutely narrowest tyre a 215/35/18. God help you if you go wider than 215 or taller than 35% profile. The top of the tyre is about 4 mm off the bottom of the spring platform.
If you wanna do the job properly, Id say get some coilovers first, then you can run the height you want once the wheels are in, try different settings until you get the best combination. Just off the top of my head, at standard ride height you could put 18s in and just take the sh*tguards out. Anywhere up to a 40mm drop will need arch work without a doubt. More than that is gonna be a challenge. The rear is actually not that bad though, there seems to be plenty of room and a 35mm drop at the back seems to still leave plenty of room. I keep my dampers on their hardest settings though and never have people in the back.
