my buddie has a 06 Megacab, put a quad race on it, yesterday started knocking real bad, took chip off checked codes, p0251, p0305,p0148

0251-cyl 5 misfire
0305-injection pump fuel feedback
0148-fuel delivery error

What do you guys think, #5 cyl fried?

 

sounds like your buddy lost #5 injector, better get that sucker replaced!! Or even better send the injectors off too F1 and get the internals all upgraded, and a set of flux nozzles put on!!