No, the intake changes without anything else changed on a Roadster, with appropriate tune are a LOSS in power, and I have the dyno time to prove it.
Everywhere under 5k is a LOSS in torque, the higher the RPM the less power is lost. On the bottom around 2k RPM it's a 20ftlb loss. By redline it makes right around the same as stock intake did.
With the power Tripp tune, I put down 126 on a bone stock Roadster, on the same bike, same dyno it did a 127 with triple K&N filters, but that only tells the peak HP story, the torque under 5K was a notable loss, area under the curve was badly changed.
That said, as soon as you put on TORs and the smooth cross over pipe the triples are a net gain in power, and very much worth it.
Edit: it's not an increase in fuel needed at lower RPM after doing the intake, it's a reduction, the length of the stock intake helps flow at lower RPM and the stock tune becomes too rich. At higher RPM a little fuel helps, but not much is needed with stock exhaust.
The box underneath is a hold over from the original cat placement when it was there instead of inside the muffler's.