Ok,I have PR-3 ECU OBD-0 with B16A head and B20B block. I want to change my header with Integra type-R (4-1). The problem is PR-3 ECU using 2 O2 sensors on cylinder 1-4 and 2-3. So, where I should install the O2 sensors on 4-1 header and still using my PR-3 ECU? Also what you guys think type-R header for my engine set up (the engine is pretty much stock)? Thanks.