PER AXLE, 4 PIECES
Fits car models:

Mitsubish Evo 5 - 10
Subaru 04 - 15 STI

The problem of brake fluid boiling is simply traced to heat transferring from the rotors and pads directly into the fluid through the calliper pistons. When brake fluid boils, it releases air that is normally part of the molecular structure of the fluid. This air is compressible of course, and the brake pedal goes to the floor instead of moving the calliper pistons. Production cars tend to suffer from this on track days more as they don't usually have the extensive cooling duct and exotic brake materials as true racing cars. True racing only brake callipers generally come with titanium calliper pistons for one reason. Titanium as a material, has low thermal conductivity. This means that it is very bad at transferring heat. Which is good if you are trying to keep your fluid cool.

The Girodisc solution to help prevent fluid boiling is to use a thin titanium shim placed between the pad back and the pistons, to keep the braking heat from transferring into the pistons and fluid.

You can see that Titanium will transfer far less heat than steel and especially aluminium. For cars that are going to see hard or multiple track days, these shims are cheap protection from loosing the pedal due to boiling at the wrong time and making the day very expensive.

Water jet cut to exact size, no cutting, grinding, or swearing involved.

Price is per axle (Four pieces). When comparison shopping, be sure to notice the quality of Girodisc components.

For Evo Models V - X.

Stock images used. Actual product may vary.