Go to boostbysmith.com plenty of links and info on them around here. They sell a cable for $208.00 The software is a free download. You can raise your rpm limiter up, I believe it's 500rpm above the stock limiter, which they call the soft limiter. After that the hard limiter kicks in, which is the one that prevents your engine from running to hard and breaking things. The soft limiter is proof the bike has more than the factory gives. You can also turn off your top speed limiter, stock Busa will go on to I think 193mph.
Generic fuel maps are also supposed to be available soon. It's basically a point and click hack to tune your bike safely to whatever your modificaions, theres also a default to put it all back stock. Best tuner available, check it out.