This is a great overall suspension update. The Koni Sport shocks have a lifetime warranty for the original owner and have been around forever. The FM springs give an excellent combination of ride and handling. The sway bars let the car corner flatter and let you easily adjust the handling balance of the car, while the springs and shocks work together to keep the body under control. Every Miata will be happier with a Stage 2 suspension.
How much will this kit lower your car? We can't tell you, because Mazda changed the ride height of Miatas over the years. However, if you measure from the center of the wheel to the fender lip, you can compare your car to the final result. It's not a huge drop but once you drive the car you'll appreciate how well it works.
Specifications for the 1990-05 cars
Front springs: 318 lb/in
Rear springs: 233 lb/in
Front ride height: 12.5"
Rear ride height: 13"
Includes FM sway bars, bumpstops, FM springs and Koni Sport shocks.