I have asked the same question to a couple of different service people at different dealerships. And they have all given me the same answer. Unless you are going to install full system. Re-jetting is not necessary. The only thing that I have done is shim the carb needles, installed a K&N air filter, and the Yoshimura RS-3 Bolt-on.
Go to your local Radio Shack and buy a multi pack of washers for about a $1.99 Part # 64-3022 Use the #4 washer, which is about 3 mm in diameter to shim your carb needles. Only use one for each needle.
http://www.radioshack.com/product/in...tId=2103391&cp
Or you could go with a Flo-Commander
http://flo-commander.com/index2.html