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Old 10-21-2019, 08:46 PM   #4 (permalink)
2000mc
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lawrence, KS
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Saturn-sold - '99 saturn sc1
Team Saturn
90 day: 28.28 mpg (US)

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Id bet the main restriction is the cooler(s). 3/8 or 3/4 lines might see almost the same pressure and flow.
If you did flow more, I would think it would be maintained at the same pressure, and actually increase the load. You would also be warming up more fluid, and increasing vehicle weight. Probably going to cost you 0.00021mpg
I would think the factory setup would be the most reliable, unless they have to be modified to use.
It may be slightly easier to route and secure smaller lines.
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