My woods are a little different from the woods back East. The timber isn't very thick but the terrain is a blast. I have a tough time choosing between the K5 or the 450f,,, both do the job. The K5 has the Gnarly, Steahly flywheel, windowed Wiesco, kips bolt mod. Excellent low-end grunt. The 450F has EFI, all-wheel-drive, engine braking, more comfortable to ride.