[Geary]

The REM (Isotropic Normalizing) process has measureable and visually obvious benefits, although perhaps not enough to warrant extensive use in Porsche racing transmissions. We had high hopes, and yet couldn't see any obvious oil temperature reduction or discern any increased longevity. Would I do it with my own parts? Probably. But properly masking the areas that shouldn't be made more slippery is very important. You need friction for synchros to work, so this is just one area that you would definitely wish to mask.

I believe that Cryogenic treatment is promise built atop theory, without real merit. Cryogenics has been extensively tested in the automotive industry, with no scientifically measureable benefits.

One example is Brembo, who had the most to gain from the magic promised by Cryogenics, as it supposedly worked exceptionally well on cast iron brake rotors. Brembo spent about $100,000 in testing, and in the end couldn't see ANY benefits to cryo'd rotors over non-cryo'd rotors in any test performed.

The level of austenite transformation is pretty well controlled by knowledgeable heat treaters, without having to rely on the "cryogenics experts" to wave their magic wand at a later date. If there were measureable benefits, the heat treaters would perform this step IN HOUSE, as they have all the equipment to do so. Yet, in recent years, some of the world's finest heat treaters have dropped the cryogenic freezing step (which for decades has been common in the heat treatment of high nickel steels) altogether, and replaced this extremely low temperature treatment with common refrigeration prior to tempering.

The enhanced grain structure of forgings over standard billet (and certainly castings) is quite visible under magnification, while the "realigned grain structure on the invisible molecular level" of cryogenically treated components is just too convenient. Invisible likely = non existent. Enhanced grain stucture can be had for a few dollars more through material selection. Invisibly enhancing the grain structure after-the-fact ? Come on.

However, I must admit that the power of suggestion is powerful. Some very respected mechanics swear by cryogenic treatment, and pay to have this performed on the most unlikely materials, swearing up & down the benefits that they have seen with their own eyes. Rather baffling.

Just my two cents --