Hi sir , could anyone tell me what is the function of the B16A P30 ECU knock sensor board ? why the P08 and P30 ECU almost the same just the difference of having with a knock sensor board or without it ? Any one know how to do chipping on this both ECU ? Why some people say with using the D15B SOHC Vtec ECU P08-901 modify the Chipping then it can be use for manual and auto transmission car ? Thankx .