mods for 2002 kx250

I just got a 2002 kx250 sofar it only has a pc pipe and that's it.what would be a good mod to give the bike some better throtle responce and bottom end with out loosing any in mid or ontop.most of the riding I do is realy fast trails but I do alot of ramps that have very little run up.I don't wana do any motor work right now I'm just wondering if there is a bolt on that will help me with this.all help is much appreciated

won't a v-force take some off the topend?

would the v-force acctualy be the best one or should I get like a boysen or something?