If you’re in the Millville NJ or NJ area, I would suggest a Leopard and race with the F1 Gear Up series. The Formula 125 TAG class has many participants in the events. Leopard motors are dependable, easy to tune, and you can find many of them around. Club races in the NJ & NY area all have Leopard accepted classes. I just got involved in karting in 2015, did my research and opted to buy a kart with a Leopard and also bought a spare Leopard. I live in the Philly suburbs. In this area of the country, X 30’s are around, but Leopards still out number the X-30’s. just some suggestions.