glass pack

My muffler has something stuck inside of it which is making a terrible noise while I drive down the road. I figured this would make it a great time to put a new exhaust system on it. It doesn't sound very good in its current form so I was thinking about putting a glass pack on it or making it a...

Is it a good idea to replace my original muffler with a glass pack will this increase my hp and make my car sound nicer. Or will like I fear it make my car sound like a rice rocket.