My observations are that the Banks kit helped the Ford much more than the Chevy. This was from the information that Banks, themselves published, three or so years ago.
There are several areas to consider: intake, engine tuning, headers, muffler, and pipes.
The Banks solution changes everything but the engine tuning (actually they do include a programmer now). The UltraPower touches the intake, engine tuning, and mufflers (no headers, or pipes).
Now my impression was developed several years ago and the numbers on the current Banks web pages look different. Banks claims
53 hp for the Ford and
70 hp for the Chevy. They claim 69 lb-ft torque for the Ford and 92 lb-ft for the Chevy. This is a flip-flop from earlier, where the Ford had a better gain. The HP curves are shown on the Test Results links of the above two links.
The other problem was that the gains with the Banks system was at 4000 rpm or higher. I don't want to go there and the UltraPower gave more help on the lower end.
See the chart of my improvements.
At the time UltraPower seemed a better solution for the Chevy engine than the Banks solution.
Linear Mode
