Those coolant lines are there to cool the exhaust gas before it enters the engine. if you still have an operating EGR valve, youmight want to reconnect them.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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