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

Joe was referring to the ~$3000 FAST XFI made specifically for the Hemi that includes a 92mm TB with adapter to fit the 6.1 /5.7 intake.

For plug and play, never gonna mod the motor, the factory computer is THE answer.

When you start modding, it's not as clear cut.

Factory computer email tunes are ~$100, and you need a handheld diablo trinity or similar. If you go with a common mod set up, the tuner should nail it first time.

FAST XFI & MS3x are very similar, though a significant price difference and a significant effort difference. Mega squirt is cheaper and requires hours to find parts and wire when installing. I do know first hand how well the mega squirt will 'self tune' the fuel table. Tuning fuel is not hard. Tuning spark without knock control could be an issue.

There are other options as well, but most are based on one of the previous mentioned systems.

Around here, I can rent a dyno for $50/hr (3 hour minumim), or hand it off to be tuned ($125/hr including dyno time). The tuner said I'd be looking at 4-5 hours, so $500+ for him to tune it. Also, he's never tuned on mega squirt, but isn't afraid of learning something new (the aftermarket options are all pretty much the same).