Hi i have been looking for some info on the J&S Ultrasafeguard Device for Knock/boost Retard..No luck on the s2000 Board
The Device is quite interesting as it Retards the Ignition for boost/knock automatically and as i get it its capable of Retarding individual cylinders based on Knock or Boost
Anyway it sounds great since its Automatic and offers a safety margin when tuning..
and you can advance the timing and if you go too much the Safeguard will retard it and show you a knock and tell you to back off the timing ..
Anyway Comment are Welcome and i plan on getting it and using it with conjunction with the AEM EMS till i learn to tune the AEM better.
here are some pictures from their site for reference and some comments they sent me when i asked if its compatible with the S2000,From a Turbo S2000 user
http://www.jandssafeguard.com/Giles/AEMknocklog.html