I don't normally think of our Harley engines as being very sophisticated for these modern times. But, the HD engineers have incorporated some pretty sophisticated stuff in the form of the ECM and fuel injection into the bikes the last 3 or 4 years. The little black box or ECM does so many neat things which monitor and control many of the goings on of the bike, in the background. I am not ready to send a thank you card to the MOCO just yet though. If it were not for the EPA we would still be running carburators and belching black smoke out our straight pipes.