Cryogenic treated apex and side seals and corner plugs any good and whats the max boost i could throw at them on a race ported engine with 2mm seals

 

would have to be more specific, each apex seal set from different makes has different hardness and toughness levels. cryogenic treatment generally trades toughness for hardness, making the material more durable but also more brittle. materials already known to fracture for apex seals, i don't know that i would trust with cryogenic treatments.