will this help my kfx 400 with power and sound,and is it easy to instal?

 

I installed a noss machine K&N kit on my quad.
I used an angle head drill, and did not have to remove my airbox. It took 1/2 hour at the most. Fits good, $100 with outerware.

will be louder then stock if you remove the lid and or snorkle.

If you remove the lid and rejet, you will notice a gain in power, if you leave the lid on you wont notice little to no power gain.