Yes, you can run the return to the oil pan if you want. Just make sure that it is above the oil level or else it won't drain properly.
As for the return size, I don't know, but I think I have heard of others using -10, but I'm not sure.
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Brian
Keep it shiny side up, but show them your dirty side once in a while.
11.3@123mph on 195/75/14" whitewalls. Yes, 195s!
11.2 on the big giant slicks. What's the point? Maybe I'll go back to the whitewalls. They are lighter and have less rolling resistance.
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