I have a set of Lobaks and really like the way they sound!! No glass to get old and they lood good also!! They are the spiral type of muffler! They can be purchased at:
Dave Stuart @ RPM Co.
Hayward, CA
510-783-3714

I would exit the car with the exhaust and not underneath the car because I would want the sound going out to all to hear the beautiful rumble and not only to my ears inside the car!!
Terry