You wouldnt want to cryo treat piston rings anyways as you need them soft enough to wear into the bore when running the engine in. Treating the piston itself is probably more important as you want the ring lands to be as strong as possible. But I dare say that nothing is going protect them from major detonation that can already kill a standard forged piston found in the ej207 short block.

As for my gearbox. If I get someone to break the gearbox down and pull the gearset out. Each gear or shaft shouldnt be any more than 200mm wide. I think.

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RS Liberty - Because WRX's are only good for parts...