Better look somewhere else if you are after more power, like have it tune properly if your stage iv was done by a harley dealer with only a flash tune. What exhaust you have? Going bigger without all the supportive accessories will not help. Maybe look at 107 or maybe a 110 drop in kit? Talk with shops, like fuelmoto, hillsides just to name a couple they will steer you in the right direction.
A forum community dedicated to all Harley-Davidson Road Glide owners and enthusiasts. Come join the discussion about performance, builds, accessories, mods,specs, troubleshooting, maintenance, and more!