So I have to get pipes and some sensor thing? Is this something that can be installed by myself?
He's refering to O2 sensors, whch are part of the emissions system on the bike. Look to see if there are what look like spark plugs attached to your stock pipes, on the underside of each - just below the front cylinder for the front pipe and below the 'C50' emblem for the back pipe. You can't miss them. If you have these, you need to get pipes with the holes (bungs) to accept these - if they are not there, you are fine.
As far as fitment, I believe that pipes for an '09 should work for your bike. You won't gain any power with just pipes but you'll feel like it 'cause they're louder
For power gains, you need a package of high flow air intake, fuel processor and pipes to get about a 10% power gain.
Get used to laying out money for mods - it's a fever that we all seem to get
Cavie's right - we're all gonna say our setup is the best. Typically, Vance and Hines will give a lower rumble where Cobra and H&K will be louder with more of that BRAP sound.
Have fun and post pics of the results.