Use the Barnett clutch springs or you will fry your stock clutch quickly. They are about $20 for a set and are available from any dealer. have them get the ones for the BA/SM or even the regular Bonnie/T100 will do.
You do not have to replace your clutch plates either, just the springs. Oh yeh, you may need the special clutch tool too if you have to remove your clutch basket. You probably willnjot have to as most of the bikes since late 02 had the newer clutch with the larger center hole and they are self aligning. You'll know when you get in there.