You're gonna get a plethora of replies.
I started off with my 10' XC using nascar6 rebuilds. They were ok.
On my current XC, I started with stock, went to D&D's, too tame, unwrapped the baffles, still no joy.
Went to Vance & Hines, this is the sound that our bikes should make!!! If you want a tad tamer sound, you can get a set of baffles and put them in. My .02 worth, I'm sure lots are gonna jump on this bandwagon.......
2013 Anti-Freeze Green XC
Vance & Hines Slip On's
Lloyd's VM1-DR Cams & Timing Wheel
Lloydz Air Filter, Lloydz Rev-Extend
BadBoy Horn, PCV
Gustafsson +4 Windscreen
Picasso Nano PN2.350D Amp
Audison Voce' AV X6.5 Speakers
HMD520 Gorilla Bagger Bars
2010 XC 116 Big Bore - Gone
2006 Hammer - Gone