Ok, I was considering a new intake and exhaust. I was thinking of using a Flowmaster Hushpower II, but i don't want it to be too too loud. And i'm affraid of getting mud in the new intake. What can I do?? Any input on the muffler would be great. I want one that is efficient, but not annoying to my fellow passengers and/or drivers. Thanks Guys!!

2000 Xterra XE
pretty much stock.