1. Here's the key to firing the coil-on-plug ignition system of the LS2. At the time of our test, the only company that offered an ignition system for the LS2 was UMI Racing. This is because unlike earlier LS-series engines that featured a 24-tooth reluctor wheel on the crankshaft, our '06 model-year LS had a 58-tooth reluctor wheel. UMI had a computer in stock that is easily tailored to work with either carbureted or fuel-injected late-model LS engines and the new 58-tooth wheel.