You'll be fine with a 15% pulley, and if you ever feel the need later it will be easy to change to a 17% because the hard part will already be done. We have great packages with FREE tool rental.
http://www.waymotorworks.com/product...cat=325&page=1

And def. plan on getting a swaybar as your other mod, it's the other biggest bang for the buck mod you can do.
http://www.waymotorworks.com/product...3&cat=0&page=1