[johnsjmc]

The SC uses 2 different rev limiting systems. North American versions use a fuel cut relay. It is located behind the instruments near the drivers side trunk hinge. It cuts the fuel pump power to prevent unburned fuel from being passed into the catalytic convertor. EXcess unburned fuel can damage the convertor. ROW cars us a rev limiting ignition rotor instead.
I have seen a car with the fuel cut relay which would stumble and misfire well below the limiting speed.We disconnected the relay and it ran cleanly to redline so we installed a rev limit rotor available from a turbo instead