Recently SEMA released its annual report about the aftermarket aspect of the automotive industry in America. We are into the 45 billion $ annual sales range. The largest segments are trucks and wheels/tires. To my surprise 60% of sales are still done in stores vs online. Also a little surprising 55% of the sales were from "non-enthusiasts", meaning not motorheads / car guys / performance types. Although all of this sounds good for the industry, there are indications that it has slowed down in recent years and will continue to do so. However "slowing down" means just not increasing as much (i.e. a slower growth rate), as it has been growing for ages.