That hose is part of the ‘oil cooler’ circuit, it’s still part of the engine cooling system. See attached picture. Service manual has the diagram under engine lubrication system.
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‘08 coupe w/Stillen SC, Custom A2A, SD, ID1050x, e85, eagle rods, high temp coated pistons, P&P heads, JWT C2, manual swap, stage 2 clutch. EcuTek(Eugene)
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