Roamer,
I am not trying to start a 172 vs Cup debate, I simply wanted to know if the kits out there are Cup specific since the 2 cars set-ups are not identical.
An Eibach kit, with say, a 30mm drop (optimistic) is probably closer to 25mm, and still within Eibachs tolerances. If the Cup is 10mm lower than a 172 already, suddenly your spring kit only drops the car 15mm. Hardly worth it if aesthetics are your primary concern.
The reason I want a spring kit is primarily to tighten up the handling somewhat. Simple physics dictates that this is achieved by using springs that are more tightly wound and also lowering the centre of gravity to lessen body roll.
The fact that the car actually lowers is primarily due to the fact that the handling is better on a lower car.
The fact that it looks better is a by-product and not the reason that I want a kit, although it does look a bit roller-skate-esque at standard ride height.