Hi Pieter:
LOL,..We've been using both JRZ's and Motons for over 12 years on 911's while retaining the torsion bar setup. It has to be felt to be believed how good it is,.......
I don't have any pictures at the moment, but they install just like a Bilstein except for mounting the remote cannisters. JRZ has a new shock called the RS that has integral cannisters so thats not a concern.
Shaun:
IMHO, while Fox shocks are very good, they simply do not compare to Moton or JRZ's as those are in another league.