Hey I have a 94-97 Miata torsen with the axles and driveshaft so it is plug and play for 90-93 if you install if wit hthe axles and drive shaft otherwise you can just bolt up the diff using your own driveshaft and axle if you have a 94-97m miata. I was gonna put in a car but decided to go to a different route. I'm only asking 450obo just give a call or text at 408 726 1087