which parts for 250ex?

[Rider-trx_250ex]

now i dont know what i want for christmas so i decided to get stuff for the quad. a hmf full system, outerwears airbox cover, uni air filter, handguards and grips. i want a high comp piston, cams, and a rev box too. now these last three things are not that common but are aviable. who makes high compression pistons, cams and rev boxes? I found a web cam and a amr racing and big gun rev box. where can i buy these parts from? and is there a difference between a rev box and a cdi box? any info would be appreciated

[red4ever]

you can buy that stuff at motosport, rocky mountain, dennis kirk and the piston u can get a powroll bore kit it has i think 11.5:1 but i think thats the only high comp 250ex piston