A couple things...
If you raise the rev limit on a stock engine, youíll probably never reach it since it stops making power as it hits that RPM. Itís also not recommended unless you upgrade the valve springs to handle the higher RPMs. Iíve seen something about swapping a 2009 LTR CDI, but it requires some changes to make it work, not bolt-on.
Still, it wouldnít do much for you since the engine wonít gain much (if anything) from it and could be catastrophic.
94mm bbk, +4 stroker, Hot Cams, Vertex piston, FMF Power Bomb header and Power Core can, KW black diamond valves/dual springs, FCR39, K&N, Elka long-travel LT fronts and rear, Houser +3, +3/4 LT A-arms, American Star pro xs chromoly tie rods, Dyna non-programable, Tusk +3 axle.