I ended up running a catch can on mine, but that's because I was tired of oil spitting all over the intake. I have a Mod Man as opposed to the XV, but I think they have similar setups. In my case there's a small 1/4" NPT (or something like that) port on the front driver's side head and rear of the passenger side head. Normally you'd have a breather on one side and a vent hose on the other (fresh air in one side, vacuum on other to purge crankcase). I have one side capped (no room) and originally just had a breather on the other side, but it kept spitting oil on my intake. Ended up running a line from that port to a catch bottle and running a second line from the catch bottle to the air cleaner base. No fresh air at the moment, but it seems to work okay. Not really enough vacuum at the air cleaner base plate to cause suction in the crankcase. It's more like a vent for the can than anything else. Alternatively, you can just put a breather on the catch can.
For what it's worth, my catch can is just an aluminum water bottle with some fittings screwed into the side and sealed with a little silicone. I put some steel wool in it to help grab the oil mist out of the air. So far so good, haven't noticed any ill effects and didn't cost me anything side I already had the bottle and fittings.