If you are new to Miatas like I am, then you wouldn't know that the R package includes a limited slip differential, upgraded shocks and springs and a host of other goodies designed for autocross and SCCA road racing. This one was purchased from a friend with about 75k on the odometer. It needs tires and a new rear window, but it's in otherwise perfect shape.
We had the car about two weeks before I started hacking on it.
As there should be for every filter, someone has done a good job of hacking them open. Check it out!