Sure, just poke a hole in your muffler with a screwdriver. It's free.
I previously spent $50 on a round Magnaflow muffler. I spent about $50 more to have it mounted just aft the cat and then exit the exhaust out the rear. I have since replaced it with a Borla exhaust.
You can also try the $200 Mazdaspeed exhaust like I just sold in the classified section.