As you can see, I used just the one "side" of the muffler. The sound is growly at low revs but screams at redline. I like it and it was very inexpensive to do. Obviously, I need to repaint a little.
I believe the GHL and Borla systems are similiar in design but in SS and more $$. Mine is not pretty but I don't have to clean the thing, either! Hope this helps.