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I had a similar thought as you and had asked Matt@Cosworth and his feedback was as under. the low temp thermostat in the car, this is worth about 3-4 bhp on its own plus you can then get another 1.5° of spark in there as the heads are colder which results in another 3 bhp Am sure Cosworth did their R&D thoroughly on it and have spent hours on testing the engine on an engine dyno which no one else has done. That is why came up with a LT Thermostat in their package. If it were just a transient gain, they wouldn't recommend it.

Yeah it bleeds oil through to maintain consistent pressure. I did think about a JDM plate but that leaves the holes in the bumper exposed. You are right you do need to oil up to temp to burn off water and fuel in the oil. That’s my excuse for driving it hard every now and then. I’ve already got the 90c stat in the oil cooler, so I just need to create a way to block off the cooler.