std GTI shocks should cope ok with a 40mm drop, but if you haven't got GTI shocks you're best off upgrading them otherwise they wont last long.  Also remember that lowering kits quote the drop
for a standard MK2.
so for example if a GTI is 20mm lower than a Driver, a 40mm drop kit will only lower the GTI by 20mm.  But on a Driver it will lower the car by 40mm.  Confused yet?
Thing is, if you're stripping the suspension down it's false economy not to at least replace the top mounts & bump stops, as they're most likely to be worn and you don't want to have to strip it down AGAIN soon after
