what kind of air box mod for raptor 660 with hmf full system and cdi and what kind of jetting

 

Depends on what kind of riding you do. Well first off, its very smart to get a perfomance filter, i prefer K&N but thats my choice. If mud isn't an issue i would buy an outerwear($10-15) and take the lid off, this will get you so much more flow and the pipe will sound great. If mud is an issue i would still get a perfomance filter, and drill a couple holes in the lid with a drill. Probably not very noticeable, but will work. I plan on getting an outerwear and cut the top of the lid off but keep enough there to keep the snap peices on. I have no clue about jetting. I have a raptor 350 but i'm assuming it's the same thing for a 660. Get more than 1 opinion than mine before you do anything. Hope this helps!

 

you can see my mods on my page, im running either 155-160 or 160-165 i cant remember.