Your pipes do kill your top end some.I ported my brothers shee,and he had those pipes and even still could pull good on a 1/2 mile flat trak. ditch those heavy tires,get it ported,Iwould say 15 front sprocket and 20 rear tires.Pro circuit pipes would be better,but not a must have to beat a raptor.Raptors are underated though,I bought one and the torque ,and less wheel spin is great,how,ever would not touch my old shee on a longer straight.