Ok, OK, I'll play ...
All 996's came with dual injectors including the 1999 model. Prior to the 996, only the SP and SPS bikes have dual injectors. But those other bikes have the larger P8 computer which is capable of firing the injectors sequentially meaning the second injector only comes into play when RPMs go up.
The 996 is controlled by the smaller 1.6M computer which is incapable of firing the injectors sequentially. So the bike does not run well with both of them firing at the same time all the time. According to FIM, dual injectors are not needed unless you're making more than 120HP, and have developed a single injector chip for the 996.
Read more about it here:
http://www.moto-one.com.au/performance/996eproms2.html This is a quote from FIM's site:
"We have two UltiMaps for the 996 Biposto '99/2000 model. There have been many problems with these models spitting on low throttle or cruise at low speeds. We have finally made a chip which cures the problem (type UM222), but requires that one injector be disconnected from each cylinder. This is because the 996 has two injectors hard-wired in the harness and we can't switch one off like we can with the 996SPS or early 888 computers. The benefit is that the single injector spits more cleanly at low durations than two injectors do ( because they have only half the time each) and idle and low throttle repsonse is heaps better. We remapped a 996 with this mod and the difference is incredible. We do sell a twin injector verison of the same chip (type UM221), but in most cases the UM222 works better, and is worth the effort."