I first heard about this on here sometime but never saw pics. If you dont know the right side where the stock pipe or aftermarket mid pipe is attached is very restricted. Here is 2 befor pics and 1 after. It's kinda hard to see in these pics but look close you'll see it

 

I'm going to try a single side exhaust, on the right. I bought a header on e-bay and cut off the left side welded it up and cleaned it all up so we'll see.......

 

Been there, done that. You'll lose some torque low and gain hp up high. Make sure the can you use is built for double duty. Jetting for it is a bit of a PITA.

 

Do a search, lots of info abbout it (I posted details about my swap). I have ben running a 2-1 for a year now and love it. Although I haven't run my bike on a dyno since the swap, I chatted at length ith chaps in the UK who are knowledgeable with the practice and pulled some dyno runs and the result is a noriceable bump in low and mids with a slight drop in top-end. In terms of jetting, if you are jetted with a DJ kit for slip-ons, it is practically just a bolt-on affair (as it was for me). Good luck.