So I looked up the prices for both of these cans tested on the webpage for UPR and EcoPower.com. The base RX is 199, The UPR is 129. After you add the diffuser and extension to the UPR it comes out to the same price. With that said, I still don't know which one to buy, but I will be getting one sooner rather than later. I'm very interested in how phase 3 will end up. If both cans pull about the same amount, I think either will be good enough to be put on my truck. I will have to look at the mounting positions/placement to see where it would best work for me. Thanks again @Ford850
for doing this test as well as you have.