I used to have a1979 RX-7. By looking at the engine number, a mechanic told me that it was actually one of the first 500 made. The smoothness of that engine was unbelievable! At 90 mph it had this humming sound that made the hair on your neck stand up!! What a joy to drive that car!! I have yet to sit in a car that so perfectly fit my body. Sold it for tuition money for my last year of school. Money well spent, but someday I'll have another one.