its a 4cylinder, its never going to sound fantastic.
He could always get one custom made. That way you have control over the whole set-up. Where you want stuff to hang and whatnot.
Plus, it is usually cheaper, and, he doesn't have to deal with the connister popping out the back. He could just get a reasonator in place of the muffler, with a nice down-turned tip to keep things discrete. I loved the turn-down tip on my merkur. It kepts it so discrete, when people looked at the car, no one ever though it was a performance car, and when it spooled up, no one looked at the car. It was classy.