2010 Mazda RX-8 GT Automatic.
After installing the AEM CAI, it made the car:
1.) Sound much more throtier, especially within the 3-7k RPM.
2.) Feel more responsive, it's really noticeable when accelerating from 0-35.
3.) Seem to get less MPG by nearly 5-10 miles per tank.
Overall, I really like the look and sound. It's easy to install and even saves weight. Unlike most CAI's, AEM has been dynoed with great results.
I would most definitely do this installation again.