Smooth running, strong parts, and control Drive Pressure excess with very intricate tuning with the fuel and turbo RX put on the engines. The boost excess is getting very amazing when all the fuel is jammed into the mix and what these make for power is a real nice deal. I'm just set back at the costs it takes to put it all together and keep it running all season. It's racing, expensive sport, I just read and try to spectate not enough but it's fun to see it develop and go along each yr.