D2 = crap! have them on mine, cannot say a good thing about them apart from the handling is great, they are noisy, bottom out a lot and had 3 of them replaced already. Maybe its just the ****ty irish roads. Ksport are the sister company of D2, customer service from both is non existant.
SAw an advertisement for the K-Sport ones on the back of Modified Motors, one section it says " we fix all our coilovers ourselves" or something similar. they would be fine for track use only!
Edit :sorry only realised now your talking about BBK(Big brake kits... DUH!)