Changed to the Ti GSXR can a few weeks ago. Using my digital scales there is a 6 lbs 4 oz weight savings weighting both then GSXR muffler and mid pipe aganist the stock DR muffler. Made no changes to carb jetting. Mileage nor performance seemed to change. So if you want to save 6 lbs 4 oz make the change. I liked the quite of the stock pipe but wanted the weight savings since I always over pack when traveling. TravelGuy.