I have added a knock detection module to my megasquirt setup (
http://www.viatrack.ca/ ) on my NA 3.2ss. My detector is on the case while the 964 used a detector attached to a metal bridge across the cylinders. So far, I have not had detectable knock issues on 93 octane and low winter temperatures. However, I am in the process of starting a turbo conversion. This will be the real test.