firecat 700

So I'm thinking of stretching and widening the track on my 7. Just something to do this summer. Does anybody have any suggestions on track length?

I have an 03' Arctic Cat F7. It hasn't quiet turned to 5000 miles yet but is close. The sled is very clean and still looks brand new. Its never been wrecked or rolled. My mom rode it since it was new. This sled rips. Comes with: 128" sno pro track which has bigger paddles v force reeds...