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Yeah it’s used as a cooler to prevent coking not warm up the oil but I’m sure it does a little of both. It would be easy for you to add one all the ej Subaru blocks have the same external dimensions all you would have to do is install the cooler and the fitting in the block, there is on hard line and three rubber 90 degree hoses possibly put a different water pump on idk if you’re pump would have the fitting the coolant pipe goes to
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