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the works one just like the OEM one from subaru for wrxs. I had the WRX one for about 2 years, it helps warming up the car, its quite helpful for daily driving, but even spirited driving would sky rocket the oil temp, not to mention track use...
no idea about the perrin one
I currently have the jackson racing dual cooler, it helps warming up the car. best of all it keeps oil temps about 105C on track
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