Hey I have a 2006 mazda 3s hatchback with the 2.3 and I was thinking about modifying the exhaust a little bit. I'm looking for something along the line of a cheap muffler or cat replacement, but I'm eager to hear from anyone who has modified the exhaust on their 3 in any way. If you've heard in person or have any exhaust mods for your mazda 3 I'd like to hear from you!! I'm open to any opinions or suggestions for an exhaust, but I'm more interested in a deeper tone, rather than a loud ricey exhaust.