Just did the 15 minute Idle procedure after installing the Wings exhaust with the large tip. I have also installed the UNI-Foam filter, oiled and greased (greased at connection of filter and air box) with the stock air box cover. After 15 minutes no noticeable problems. I let the bike cool down and then started the bike again and cracked the throttle. Had a little rumble at Idle and a rap of authority at higher RPM. Not to loud in my estimation, but then most of my riding will be in the woods, not in town. If I needed to go into town I would just be real easy on the throttle and you shouldn't be noticed.