Watching vids on youtube I've noticed that aftermarket exhausts on the 850's sound sooooo much better than the same exhaust on the 800. Is it simply the cam? Would a cam swap in the 800 produce the lower, throatier tone like that of the 850? Or is the 850 just a totally different configuration all together, internals and what-not? The 850's produce an almost muscle car-ish sound, which is what I'm after.