No sooner had the idea of a full World Championship for so-called production machinery been agreed in 1988 than half the manufacturers had already created homologation special road bikes which then dominated most of the early results. But that was only part of the story, then and now.
WorldSBK has never been a true production racing series, whether you started in year dot with a super-special 851 Ducati or a humble Kawasaki GPX750. Chassis or engine; you could legally muck about with them.
Really, quite a lot.