Individual Cylinder knock controller

[John at J&S]

We just released a new knock controller for direct ignition, called the Vampire.

The system retards only the knocking cylinders, permitting the engine to make more power without sacrificing reliability.

Installs without cutting any wires. Control wires simply splice into the coil negative signal at each coil.

http://www.jandssafeguard.com/VampirePage/J&S_Vampire.html