Just like the post says, What exactly do C51 & C52 control. On the infamous Ebay chips these are optional or they are not mentioned. Do they help n/a motors or hurt them. I have heard they change the fuel curve. They are 103 ceramic caps. AllMotorMonster can you or anyone tell me? I am just curious. I just chipped another ECU for a friend and they were optional in the instructions, so we bought them and and soldered them in.