Well you have a lot of optionsLSGSRK20B16Type RK22etcbut if you really want to go fast i love the trpe r motor but there really expensive. But you can also get a single cam v-tech there fast also. I mean i have a single cam v-tech with nos and it is very fast. If you want something cheaper i suggest a LS not as fast as a Type R or K20 but its fast.