We've fitted them to our S4 and they're brilliant!
Only problem we've encountered with them though is that they might warp the 'fixed' floating discs, as opposed to the fully floating cast iron jobbies.
We run the P4 calipers with cast iron floaters and they really are the legendary 'one-finger-braking' that other set-ups lack.
Lee.
http://www.monstershop-ducati.co.uk [img]http://[/img]