I chatted with Dynojet today. As Polaris states in their ads 'new liberty engine', the Power Commander for the '04 will not work on the '05 700 EFI. They said they changed many things on the engine and Dynojet is working on the dyno with a new Power Comander for the '05 700 EFI. They are also doing the same for the 800 EFI. It is a priority of theirs to get it out ASAP, but not until it is ready to release.