04-11 Rx8 Cryogenically Treated Side Seal Set (N3H1-11-C11C-C)
Cryo treating this part is great because these ride over the extremely hot exhaust port inside the engine, and cryo treating allows heat to be dissipated more quickly and uniformly.
We prefer the side seals Mazda offers which are longer, and require hand fitting so that you can attain a more accurate fit between side seal and corner seal which allows for maximum compression and no blow by. Every rotor is different so it is better to get them longer to custom fit each slot, these are also cheaper than the pre-cut letter versions. You will need to remove approximately 0.05" (1.28mm) from each side seal.
The cryogenic treating process creates a denser, more uniform grain structure that allows heat to be dissipated more quickly and uniformly. This tighter molecular structure also increases strength, wear life, and fatigue life. This is great for rx8 side seals because these ride over the extremely hot exhaust port inside the engine.