Join Date: Feb 2019
Location: Panama City, FL
Email word for word From Nightrider
From Steve M.
We are in the process of updating the software of our FL-AFXIED-17 products to improve M8 compatibility.
But fear not. There is no technical reason to update or modify your bike to add exhaust and/or air cleaners. The HD ECM is designed to modify injector opening times to ensure OEM fuel mixtures are maintained. By monitoring the O2 sensors in closed loop operation, the ECM knows how much it has to adjust the injector opening times and maintains a history over the past 2-3 hours of what has changed. This "Adaptive Learning" capability is common to all late model motorcycles and automobiles. In fact the HD uses a Delphi ECM that functions almost identical to the EFI system used in Silverado, Camaro, and Corvette. You would never take those vehicles back to Chevy for EFI upgrades after changing exhaust/ac. What is the difference? Nothing other than HD Marketing and under-informed mechanics/service personnel.
The bikes are not "lean" from the factory, nor do they go lean when changing exhaust, air cleaner, or removing the converter. The ECM will use the Adaptive Learning designed into its software to maintain OEM AFR's.
This does not mean that a little extra fuel might not put a bigger smile on your face. It usually does, but the simple fact is that the ECM is designed to take care of itself and does a good job of it.
So you can do your upgrades. Most riders do like to make exhaust changes. We usually recommend simple slip-ons with a 1.75" or 2.00" inner core to maintain low/mid range power while providing a more robust rumble. There is no overwhelming reason to change air cleaners. While the change can improve power, most of the improvement occurs over 3000 rpm at 100% throttle. You spend almost all your time riding under 3500 rpm and 50% throttle, where the power improvements are minimal. So there is a mismatch between where you ride and where additional power show up (something you really will not feel).
Hope this helps.