I just purchaced this sled for 3200 and looking for some insight as to cost efficiant, and reliable upgrades for it. I have read about tunnel dumps and control boxes but havent ever used one my old sled which was a 98 ski doo that dont anymore (due to crank bearing). So here I am with a stock 05' m7 just to give an idea I ride in Minnesota and U.P. MI going west somewhere for the first time this year. I do trail ride so I want to keep the 141" track until I get used to it before I go bigger but I love going off the trails were ever there isnt a fence. Any ideas far a guy finally movin up in the world of sleds!