hello just was wondering what everyone thought.. anyone have any comments to the rev cdi boxes they sell on ebay? do they help with anything or just give the bike a few more rpms before cutting out? also i want to get a new pipe for the bike.. what is recommended? i would rather have more of a gain in the low end than the top but any gain would be good!... is a new head pipe recommended? i would like to get something that is of pretty good quality and doesnt cost 700$ like some i have seen and another thing... does it seem like 4th gear is either really short or cuts out too early? my b uddy has an 04 crf450 and if we race straight line.. i will pull from start until i hit 4th and then he will catch up and pull ahead a little but they both top out at the same exact speed... well honda might be .5 mph faster but close enough... is there a good sprocket combo to give a lil more top speed and actually make 1st gear functional? it seems pretty short to me but i never really creep around the trails so kinda useless.. i just always use 2 to start in... thanks for the replies in advance!