is there any CDI boxes that i should stay away from. I want one that will give my 300ex a little better performance. thanks

 

They are all pretty much the same, except for some being able to choose a curve. But they all have the bugs worked out for the most part. Just depends on how much you want to spend. I went inbetween the moose mod, and copperhead vdi and got the dynatek cdi, and love it! If i had the 400 bucks to blow, i would get the copperhead so i could pick different maps, but with this you have to rejett also.