2008 Mazdaspeed3 with resonators removed and replaced with straight pipe. Cost 100 bucks and took half an hour or so to do at an exhaust shop. Gives the car a nice deep burbly tone that I love and is reminiscent of a Subaru Boxer engine. You can hear my CP-E Nano and PG inlet in the background.
The sound the 4 cylinders in the 2002 Mazda Protege 5. I can't believe this car only has 43,000 miles! (sorry for the lack of revving but it is mainly a sound file, and the fact that these cars were cold and its bad to rev cold)