You do not need the loudest exhaust; most people start modding with three items--exhaust, intake and a tune. I would be more concerned about the performance over sound. That goes for both the motors. Just saying.You can want your vehicle to sound good for yourself and your driving enjoyment.
Making it sound loud enough for the neighborhood to hear makes you "that guy". And why I moved outside of the city.
However, on topic: if you wanted the 2.7 because you had to have the biggest motor, congrats, it's a crummy sounding motor. Don't pop the hood, don't revv it for your friends, you keep that engine to yourself.