Here is what Fidanza has to say about the product:

"Our aluminum flywheels are made from the highest quality 6061 T6 aluminum. The material is fantastic for strength, heat dissipation and of course reduction in weight. The friction surface we use is an incredibly strong 1050 steel. The plates are milled to meet our high specifications. A Fidanza flywheel can mate with any type of clutch material, including organic, kevlar, ceramic, metallic and sintered iron. We attach the friction surface with military grade aerospace fasteners. The ring gears we use are also made from 1050 steel and are heat treated for durability. The gears are heated then pressed on and secured with grade 8 button screws. We were the first to utilize a stepped dowel system in most of our flywheel applications. This doweling method ensures that once the pressure plate is installed the dowels cannot be removed because they become locked into place. Fidanza designs and builds flywheels with extreme precision. We give tuners, racers and builders the high performance and unmatched power they're seeking."

Fits the 2004-2006 Mazda3 2.3L, the 3S and SP23 Model. Does not fit the 2.0L 3i or Mazdaspeed3. Weighs 8.5 lbs.

Aluminum flywheels have been used for many years for increasing performance. From the earliest days of racing and street build-ups, the world's best engine builders have been installing aluminum flywheels to give their engines the needed edge.

Not only will you see a dramatic increase in usable horsepower from your Mazda3, but engine life can also be extended since there will be less stress on the crankshaft. To achieve the greatest increase in performance an aluminum flywheel must lower the moment of inertia characteristics of the engine.

Put in simpler terms, we must reduce the amount of horsepower needed to turn the flywheel so that horsepower can be used to turn the wheels. The flywheel itself is made from either 6061 T6 or 2024 T3 aluminum depending on the model. Both of these materials are tempered aluminum which are very, very strong yet very lightweight.

The best choice for your 2.3L Mazda3.