I changed the foam in my seat to rebond foam, the part where I sit,. and moved the back rest back about 5 inches, and put a rear ward slope in the foam, so I do not get that wedggy feeling, and wider where I sit, and my DNA filter is installed , I find the engine is smoother and pick up better, all the way to 80 mph. last week I traded the tread bare tires for pilot power pure tires,at 38,000 km. after that, keep on riding , its later than you think!