I have the Banks ... the CFM testing results below is how I made my decision.
It doesn't surprise me to see that the Banks is able to show better flow numbers on the test bench as their opening on the fender side is noticeably larger than the actual fender opening. I always take Banks advertising with a grain of salt & look for independent results.
I know ATP Trucks (Idaho Rob) had done dyno testing with the Derringer & the S&B and they saw a 24HP gain, Banks only shows a 19HP gain over the Derringer using their intake. And the S&B is $80-100 cheaper to boot....