Well im not exactly sure what cubs is but i do kno that i have CPI in frame drag pipes and i do have i believe there 34mm mikuni carbs and a better after market boost bottle. plus V force reeds, with K&N air filters with outer ware, its got a coolhead with 19cc domes and an extremly agressive porting job, inside the engine i really dont kno if it has shaved pistons or new high compression ones but then again i was told that you cant do anything else to the motor unless i bore it out or Big bore kits or stroker crank.