Lots of good info here too.
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SuzukiB-King.org - Portal
You can flash the B-King's ecu as a Busa's with Ecu Editor, as well as remove the restrictions(1st through 4th timing restrictions, top speed limiter, increase secondary throttle plate opening rate, and a few other things).
Remove the cables and servo on the butterfly valve in the exhaust midpipe, or you can also cycle the key in a certain sequence and it will stay open all the time.
You can also cut the air intake holes in the airbox lid out to 2". Then add silicone hoses with a 90 degree bend.
They'll push into the airbox lid and extend out through the frame openings, which are behind the side pods on the tank.
It works as a cold air intake, but has some ram air effect as the pods do trap some air.
The B-king's stock dyno numbers tend to be around 20 whp less than the Busa's(stock vs. stock), yet the engines are 100% mechanically the same. It's all in the tune and airbox.
The smaller airbox design is of course to fit under the tank; but the B in B-king originally stood for boost.
The B-king was supposed to be factory supercharged, but emmisions and cost killed it later in the design.
That is the only reason I've been able to find to explain why Suzuki did such a hack job on the airbox.
I made these changes to my B-King, and now it's just as aggressive and responsive as my gen2 Busa, as opposed to how weak it felt in comparison before.