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Yes, personal preference. Like breast versus ass. For testing flow volumes, the metal lines are a LITA since they have to be disconnected in order to be moved.
But they are more robust in other ways. They don't melt. They don't fail but then, the plastic ones seem pretty reliable also. If they don't get bent or otherwise damaged, they would outlast the rest of the car.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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