I just did an install of BOTH Fabspeeds Supercups and Fabspeeds Maxflows. I analyzed them on the street, the track and the dynamometer. More info then you can dump into a single blog so I wrapped it up into a video.
After looking at all the pro and cons, I would recommend the MaxFlos'. Net gain of 24HP, 19ft-lbs and 17 fewer pounds, and the best overall sound quality.
Find how who I came to that conclusion here:
https://youtu.be/MdCQg2tJFYg .