I put a Magnaflo catback on mine, part number 15333. Definitely increased the throttle response and has a good sound to it, makes people pay attention when your passing them. Paired it with a K&N filter and improved the litres per 100 as well.
Hey if you want it to rip, I have an 809 that will drop right in and everything will fit in that chasis the engine, the pipes, everything you will have to modify nothing to get this to fit it. Let me know.
I agree with 08154xp, don't think the xtra cash is worth it for the "X". I picked up a new non-curret 2011 163" at Martin Motorsports in Edmonton and it was pretty good deal quite a bit less than the 2012.