Rear mount turbo oil pump
 

When doing a rear mount system, do you have to upgrade the oil pump to something beefier or will the stock pump be enough?

Stock is fine, but you do need a return pump.

Agree. The stock oil pump is fine but you need an Electric pump to return the oil to the pan. I have a mid mount turbo in my 3.8 and I use the Turbowerks Race pump... its a little excessive, you can use their base pump and it will work just fine.