I had a borla muffler on mine for a while but ended up putting the stock muffler back on with a tip out the side instead of straight back. The borla was great at normal speed, 35-75, it wasn't too loud unless you were trying to get on it. But backing out of the driveway, parking spot, taking off at red lights all got old with me. It was really obnoxious in those situations and anytime when I first pressed the pedal until I got to speed.
I like exhaust systems, I have a flowmaster 1 chamber (really loud) on my v8 z71 and love it but I can't stand the v6 exhaust note. A tuned exhaust may be better, or you may like the v6 sound but I personally couldn't deal with it. Just my 2 cents.
I still have an aFe intake, and it's loud like an exhaust when I'm on the throttle, but it's not noisey at low speeds.
Also, I agree the tacoma exhausts will give you a good idea, also FJ cruisers.