best engine mods for a 400ex???

[400exredrider]

What do you guys think is the best engine mod for the 400ex?? would you say 440kit or just a 10:1 piston or a cam and gaskets?? I was just wondering what you guys/girls thought is the best engine mod.????:huh

[Nausty]

I think the 440emx kit is the best my self. Costs a lot but it is a reliable kit and it makes a lot of power focusing on the mid.

[Matt Fisher]

There's no such thing as "the best". It all depends on how much money you want to spend, how fast you want to go, and what you're using the quad for (mx, play, cross-country, etc.).

What are your needs?