What are the best upgrades on an 04 grizzly I have a itp bigfoot kit but for performance mostly trail riding and such. What are some good performance upgrades.

 

For a simple start, you can check out www.4atvtires.com. I got their HMF slip on exhaust and k&n jet and filter kit for like $295 shipped. Made a considerable difference (though its loud). That was enough for me. Not going any further (such as 686 kit or any other engine work that requires machining)