No two race cars are exactly the same. Sure you can purchase a rolling chassis from a builder that turns out 100 (mostly) identical cars a year. And you can use a body kit that uses sheetmetal ...
Ignition issues can be a real pain to both diagnose and deal with. Sure, generally speaking, having a faulty ignition coil is a better problem to have than a worn-out turbo or clogged DPF, but ...