If your looking for cheap power and dont go in much water. Remove the airbox lid and install a 150 mikuni main jet. It makes a very nice power gain over stock.

If you want to know what the endcap will do before you buy it. Remove the end cap on your bike and ride it. It will basicly be the same as the bigger endcap, it wont look as good. Not worth buying IMO.

A 13t ft sprocket will help out the low end.

A full exhaust system helps the performance a lot. I hear a lot of good things about HMF (cheap, good power).