Just clocked the RZR 900 will beat the ZForce easy. I ride all the time with a Stock ZForce (clocked) a RZR 800 and a RZR 900. There is a huge gap between à RZR 800 and the New 900. A stock Z800 is a little faster than à RZR 800, A clocked ZForce is between a 800 and a 900 but no way on par with the RZR 900s