It is difficult to throw a blanket over all ignitions systems and come up with a cut-and-dry set of rules to live by. Some stock ignitions are hurting from the factory; others can handle bolt-on mods and show no ill effects. Ignitions on factory turbocharged cars are usually more adept at lighting the mixture when the boost is cranked up-but there are limitations. An engine that is converted to forced induction will benefit from ignition upgrades. The key is to know your vehicle and have a plan of attack when it comes to modifications, including ignition upgrades.