mk cool....well i can say that exuast plays a part in the rpm range some what....most of the time, although over looked often, y-pipes and narrower exhaust are for more low end tq and less top end hp this could very well be part of the problem....i would for sure try and open it up a bit more.. try a bigger exhaust tube and get rid of the y-pipe and try an x or h pipe, and if able maybe some long tube headers...do u have cats?? ditch em or get high flow ones.....it says ur cam goes to 6200 rmp and if you have an exhaust system built more for low end tq than top end hp, ur cam and exhaust could be working against each other....thus not allowing the cam its top end potential
narrow exhaust=low end
wider exhaust= top end
and y pipes are generally low end as well
does that make sense??
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