at one point i tried cool power 10% in the mvvs .77 and it runs like Dar says(crap).
I get better performance with 80/20 . Last rpms checked
13.5*8 bolly @ 9500 (same rpm as MA 14*6, retired now)
13.5*6 bolly @ 10500
Engine is installed with 3267 muffler. It should sing a bit more with a standard 3255 muffler and be a monster with a pipe.