ps all i can say is that i tried riding around wth out the pc3 first up and it did run fine ut when i plugged the pc into the bike and loaded the map from brock racing the bike became super smooth when cruising around and powerful and aggressive like the bike should be at full power made the bike alot better to ride mapped with the pc3 i assume if you got the stock ecu tuned with out using the o2 sensor it would be much the same as tuned with a pc3
Regards
Dan
Dan