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I have no solid technical or scientific stats to give. Only my honest opinion and observations but If your oil feed line has the flex piece in it it is far more restrictive than the updated solid one. I took them side by side and just blowing through it, I felt much more resistance on the flex one, I feel that it is well worth 55 dollars to replace and takes 5mins, the oil drain tube on the other hand I really didn't see a huge difference between the old and new to warrant the change