Few details of the case are available, but the Silvia has a strong following among JDM enthusiasts despite (or perhaps because of) the fact that it was never officially sold Stateside. The low-slung coupe was offered in Japan and other markets from 1964 through 1968 and again from 1974 to 2002. Though it was powered principally with a four-cylinder engine, its front-engine/rear-drive layout made it popular on the tuning and drifting scenes. The 240SX that was offered Stateside was related, but not strictly speaking the same vehicle.
It's likely because the Silvia was never certified for use on American roads (and because the culprit apparently didn't go through the correct channels) that the unidentified man in Ocean Springs, MS, is reportedly facing a $250,000 fine and up to 20 years in prison. Here's hoping whatever else he's got in the driveway is just as fast, because it looks like he'll have a lot of time to make up for.