Exhaust fitment question

I was cruising the local buy and sell site and came across a Mudslinger RZR exhaust for a decent price. It looks good in the pictures, however my RZR is a 2008 and this exhaust is for a 2012. I checked the part numbers between the 2008 and 2012 and they are different. my question is will it fit? is the difference minor or major? I have been reading a bit lately about the the RZR S header pipe. in the future I would like to install one of those and PCV and a dyno tune. any help is appreciated.