Best prop pitch

[jacintoacuna]

what would be the best prop or recommendation for my 91 superjet ? it has a 61x 701 pro tec exhaust, riva billet head, mikuni sbn 44 carb, intake grate and d-cut ride plate. I wanna go up to a stainless steel prop whats good

 

[Mike W]

Impros 9/15 or if your are on a budget a Scat 12/17 works really well.