Looken at getten a aftermarket CDI box, not sure which one to buy looks like mostl of them are all the same but looken for in seat people that have installed and there comments

 

i bought a aftermarker CDI box for my raptor 660. i know the raptor and grizzley are different but i think they have the same engines. i bought a ProCom CDI box 2 years ago of Ebay. they claimed it advanced the timing, cut out the rev- limiter,and added 5 HP. well last month i was having problems at the high RMP range. it would sputter, back fire, and cut out. it turned out my CDI went out (i DX this by swapping out with my buddy and put my CDI on his bike which did the same and his into mine). so i am not saying all ProCom is like that, but mine went out. so i am in the market like you for something else. i am currentily running stock CDI box (which i kept thank goodness) and i want to upgrade again.

hope this helps