hello! i am currently getting a 2001 b18c1 head and i would like to know if i need the 2001 gsr ecu or would i be able to run the ecu i have that is tuned on phearable.net in a p28 ecu.. i also need to know the bore size stock of my gsr head and if it is a good idea to also upgrade, my valves, retainers and springs! thank you! also tips are more an welcomed!

 

also i need to know if i put a 2001 gsr head onto a b16a2 bottom which obd ecu and harness would i need to use.. so far im using a p28 ecu for my b16a2 head.. just not really sure about everything and how to set it up.. all i do know is that ill need hondata s300 chipped and get a dyno and tune done.. i just need to know what obd i need! thanks