anyone have the az speed + marine engine upgrade for the 496 engines done ? consists of new intake manifold , ecu change , throttle body claim 535 hp on dyno ?

Let's see what you learn- last I recall, that was with dyno headers rather than the factory exhaust- that could be good for a significant portion which you'll never see in the boat- unless you pony for some CMI's etc.

While the factory intake is said to be restrictive, I don't anticipate significant gains from just an intake/throttlebody and remap. Does the remap bump timing and octane requirements? Can Jim remap the 555 or is he changing it over to Mefi 4 (additional cost and perhaps less of a system)

I'm sure Ray will chime in here soon

What does the AZ speed and marine upgrade cost compare to the Raylar setup? Which do both start with the 375 or the 425?

I did something similiar with my 502's with CMIs, throttle body, MSD, remapping - didn't see a whole lot for the expense. This was from AZ Speed. It did sound better (headers)