I'm running the Hypertech coil on my SS454 pickup and the truck runs awesome, passed emissions easily, no sign of knock/ping with 87 octane. I was thinking about using their LT1 coil on the 94 LT1 engine in my 68 Camaro. Has anyone had problems with the Hypertech and the optispark? I've hear about problems with MSD stuff and burning up the opti and the Accel coils seem to have their own issues.