Slip on or full, either way you are going to have to mess with the carbs. Might as well save the money from buying two exhausts and get the Area P and the jet kit and then pay someone to tinker with it. You said you were considering full anyways. Also its gonna be hard to find another group buy for the Area P.
Okay, I tried my best, lol.
http://www.ecotrons.com/Kawasaki_Nin...c_EFI_kit.html
If u truly want to do the efi conversion, do that first and wait for the exhaust. I do stress you need to do ALOT of research and be somewhat technically inclined. Everybody is different and requires different solutions to problems. During my install i decided I'd rather get rid of the stock airbox and exhaust.