HD said I could install a se ventilator hi flow air cleaner on my 2018 Road Glide M8 without a exhaust and run the pro street tuner. Could not get a map for the stock exhaust with air cleaner. I have not captured all the data yet but thought it would run better than it is at the moment. It is actually slower now with the recommended auto tune. I have slip ons on the way and hoping this and more data will cure it. Just looking for some of your experience folks. My first HD. Thanks