The new YS 91SR-3DS is an amazing engine! We were able to achieve more power and a little better fuel economy. We went through several revisions to get this engine perfect. I wanted to make sure we were able to get a sizable improvement over the SR.
Right now the Tuned muffler to use with the new 3DS is still the SB-19. I will be doing some more testing with Tetsuo Hatori over the next few months to see if we can make sizable improvement’s over the current SB-19.