okay so i was wondering what would be the best mods for low end power. i ride trails and starting to ride tracks. but i never get it to top speed in the woods so therefore i dont need the top end.
i now have
14/39 sprocket
k&n filter
jetted
pro circuit t-4 slip on
19x6x10 front holeshot
20x11x9 back shredders but soon getting 18s for better low end power.

i was thinking about doing a stage 1 hot cam, but are they the best cam to choose? and i heard they make the machine tick i dont want that.
im also going to put a crf450r cam chain and manual tensioner. i dont want to change my piston yet because it still runs great. so no need to change that out just yet. thanks in advance

 

Stage 1 cam with after market cdi, maybe 13 tooth front sprocket

 

I second the 13 tooth sprocket. I know it's not increasing the power, but it made a huge cheap difference for me in the trails and steep creek beds on my stock 400ex