Yes I have a 2002 prox 440 fan and its a nice sled but I have a buddy with a mxz 500 fan and his is just a little bit faster and I dont like to lose so if any one at all knows anything I could do to make it faster in any way low end top end I dont care. Just please help out and dont tell me to get a bigger sled cuz if I had the money I would lol. Thanks so much

how much faster is his.? Start with cheap things that reduce friction like teflon sliders, plastic skis, or ski skins. If not u could always change the 440f over to a liquid cooled

Well I want to make it alot faster or as fast as that motor can do cuz I dont want to buy a diff one so any little things or even a few big things I can do I would love to hear of them thanks so much and please tell me where i could get the stuff thanks.

A good clutch kit and some jetting will help you out. Should be able to take him then. You could always pipe it...

:D

Now i was told i could not pipe my sled cuz it was a fan so if you can find me a pipe for my sled i will love anyone for the rest of my life lol if you could thanks so much.

Put in pistons out of an 03. they have a longer skirt and it will give it more low end.