Is there a true plug-n-play setup for a 5.7 with FI yet?

My understanding is that the basic Diablo Predator does give you the capability to adjust fuel and spark to some extent and you do have data logging capability as well. It just takes a fair bit of time and effort to learn how to use this stuff and most guys just take the easy option and pay whatever for an email tune that may or may not be optimised for their vehicle. Obviously the proffessional tuning shops will spend the money to have access the better tools for generating custom tunes and more scope to make changes. Adjusting shift points won't be much use to you if you are not runing the factory electronic transmission.