Given what you want, I would vote for Borla -- though I have the Racing Beat (and like it) as I do lots of long distance road trips and want it quiet when it is 3:00 PM and another 200 miles to go, yet my RB has some exhaust sound at full throttle and at 4,000 RPM+.
Here's a good thread to start with.
http://mazda3revolution.com/forums/...43018-corksport-axle-back-exhaust-review.html
Here's a good thread to start with.
http://mazda3revolution.com/forums/...43018-corksport-axle-back-exhaust-review.html