Im swapping a K20a3 with a a2 head in my 02 ex. anyone know if using the a3 ecu if you still have to get it reflashed? I know with the a2 you do, but not sure about the a3 since its from a si. IF you do, anyone know how much the honda dealer charges for a reflash? Also, anyone know for sure if the RSX subframe is needed for the a3 swap. the only info I can find is on the a2, and it says it is needed.