I switched from c-16 to Q-16 while on the dyno and made 32 more HP with the Q with a 427inch small block, bumped the jetting up 4 in front and rear, and everything they say about it being corrosive and draining fuel system after every race is true, keep it in a sealed metal container as well. Stay on top of plugs, lack of dye in the fuel seems to make them a little harder to read in my opinion