Word on the street on the new 2009 255hp, It has larger IC that has more flow, SC has more boost pressure, Titanium washers!! Bigger injectors And a new ECU for the fuel delivery. Thats just what Im hearing.
I think thats what it is. I have that engine in my RXTX and from what I read its a external IC, bigger SC, injectors and ECU! some people are upgrading their215's with 255 SC, using either stock seadoo IC or aftermarket, bigger injectors and custom ECU software to get more power.