I have a 300i DT. I was 6 ft. 2, 20 years ago, 220 lb.s I had to add 2 inches to seat for comfort and I cut the dome out of rear seat plastic, and I cut the top of seat back rest off,. then had 2 inches of new foam over it all,. to get 2 inches, added 4 inches of foam, now I can slid my butt all the way back, to where it is comfortable,. the foam is hard enough to not sag in the hole,. and you can still store a full face helmet in there, now I have full view over givi wind screen,. I will have to wait for spring to try out long hr.s of riding for comfort level,.