This is a great little motor for the price. Very similar to the Novarossi N21BF, but much cheaper. I have run about a gallon of 20% Sidewinder Race through mine in my MBX5T and it's still running like a champ. The STS pipe is a great match for this engine. It pulls hard and is easy to tune. It has lost pinch, but the manufacturer says this is normal. Compression is still good. Top end is not too bad for a 3-port mill either. If you are fairly new to buggies or truggies and want to learn to drive better, so you don't need the max power possible, go for this engine.