Looking for a lightweight wheel for the Mazda to reduce the unsprung weight so the brakes and suspension don't have to work as hard? Take a look at the Enkei Racing Series RPF1. It is a nice upgrade without breaking the bank on a tough durable lightweight wheel. In 17" they weigh 15 lbs. (17X7.5 wheel). The current cost is $233.00 per wheel.
Shown here is the Enkei Racing Series RPF1 on a couple of the Grand Am Continental Challenge cars.
Throw on some sticky tires and you have improved the car dramatically. Most people like the new Bridgestone Potenza RE-11 on the car. They are about as close to a race tire as you are going to get in a street tire. So for around $1,500.00 you can make the car handle like a race car.