some oil-cooler sandwich plates (and i'm not sure what the 4AGE looks like) have a thermostat in them so they ony allow oil to pass thruu when the oil is hot. If you replaced the factory plate with a simple adaptor and remoted a cooler with a bypass thermostat, then it would be a good place.
edit: the restricter they're talking about is the banjo-connector at the oil inlet on the turbo. The hole from the pipe to connector on my turbo (t25) is quite small compared to the ID of the hose.
note: old-style sleeve bush turbo bearings don't need a restrictor, anything with a ball--bearing core does.
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