Q: like do i have to get it reflashed or get hondata k pro or something?
A: No you dont get it "reflashed" If you buy a quality kit like Greddy, it has the engine management included. Now if you are going full on like building the motor, then you will have to get a AEM EMS, or Greddy EManage Ultimate. The Hondata K-pro is a good unit, but over-rated when compared to a AEM EMS.