Soon to receive my 950 sport. I have been watching some groups in facebook, getting my head wrapped around owning one of these things. I'm a planning type of person.  But what I dont know is what I should do first for add-ons.  Music, gotta have, but not into anything loud.  which speaker bars are good for less than $500?  I do like bass, but needing subs, old guy here!   what size O.D are the tubes for mounting things , 1.5"?    IS it ok to use regular 87 octane?  Is there any aftermarket tuning capabilities, I have a Harley and of course we have it for those, so curious if its in these things yet. I dont think I need it buuuut, you never know.   windshield(s).  will probably ride in winter, should i get the two piece so we have the lower on during the summer and both on during the winter?  just how warm/hot is it riding in these and how recommended is it to modify/close the air vent between the riders?  does it void any warranty? I planned on getting the extended warranty, but hearing some people having issues on warranty claims.  I am a pretty good wrencher myself, not afraid to replace major components. 
how bad is the winch? seems many dont like it. I dont plan on using it except to try to pull myself out of a bad situation, or someone else, but are they capable of that?   Any other thoughts, recommendations anyone want to add? I'm going to start reading others posts now!   Thanks peeps!

Forgot to mention.   Going to do front/rear bumpers,  air filter upgrades for sure.  wheels/tires/lift, maybe next year.  this year, just get familiar and not get to crazy with it!

Welcome to the forum.  Congrats on the soon to be new machine.  I have the Cforce 800XC, my manual says premium fuel only, so that's what I run. I also have a RZR and I actually prefer an MP3 player or phone with some ear buds for music.  I've never been a fan of expecting other people to listen to my music.  The first universal recommendation on this forum is to change your air filter to a Unifilter.