Many conversations around driver engagement, including the letters “Si”, would naturally revolve around Honda. After all, those letters have been closely associated with the type of affordable and infinitely drivable car that Honda is famous for. But there’s another Si that comes from BMW and can certainly be placed in the category of a “drivers'” car. It was never officially sold in the US, and it’s a racing homologation special, but it remains relatively attainable. And two decades on from its first appearance, this E90-generation BMW 320si is one of the more unusual bargains in BMW’s back catalog.