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I haven't seen high coolant temperatures just want to keep them at lower possible area as they favor advance timing.
Plus I don't trust aftermarket lower temp thermostats even from Cosworth, sorry, this is from personal experience as I was Prodrive and Rogerclark Motorsport dealer in the past and have seen plenty of them having problems stuck open or closed.
A lower thermostat does nothing when you press hard the car above a level just give you some more time until you reach same coolant temperatures and it probably increases long term engine wear.
If I go the Ecutek route there are plenty of benefits in Racerom Tom as you know, say per gear timing etc but I already am out of my plans, my aim was to flaten the torque deep and have some more midrange torque and found myself searching for more power.
It's better to give my money for brakes and suspension rather for the last ponnies that can't be easily extracted!
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