I have an hmf performance slip on and I’ve had enough of the noise. My ears would ring for hours after a ride. It started off as wow listen to this thing, then ya it’s cool, to now I’m wearing ear plugs just to trail ride. "What did you say." Crazy what we put up with lol.

I have an hmf optimizer installed, should I remove it or leave it. 2" air intake with stock filter.

The only draw back I noticed from going back to stock is a little loss of throttle input on take off only. But I can hear myself think without ear plugs and don’t have to yell at my riding buddies.