Well something is obviously wrong here... Before, my old header had HUGE cracks in it... I could literally see smoge coming from the cracks when I seafoamed the motor (you know it makes the car emissions more extreme), I replaced those and the cel still comes on... Before I could see it being an exhaust leak, but now what? Could that have messed things up? And could the fact that the last owner used the cheapest 87 octane gas, have caused problems??