Are the Air Hammer CAI kits suitable for the 3.0L SIDI (LF1,LFW) or 3.6L SIDI (LLT, LFX) engine or only the 3.6L Alloytec (LY7)?if so, what is the major difference between the two kits available?

These kits are only suitable for Alloytec engines, and not the later model SIDI type, at this point in time. In saying this though, you could install one of these kits provided you purchase or make a suitable MAF cartridge housing, which would need to replicate the overall dimensions of the Alloytec MAF.