It is very much plug and play, but not the solution for most street guys. The harnesses are intimidating at first, but very well labeled. If you can route wires, use a hole saw and do very little soldering/heat shrinking you can install this. It does not use the existing O2 sensors; it is in itself a wideband and the sensor is included.

I'll know more in the coming days, but it does not completely replace the ECU. They will operate side-by-side, you're just taking all fuel, air, spark control away from the Nazi. You still need the ECU for gauges, a/c, etc. My goal is to set it up without error codes, and I'm working with two FAST pros that think it can be done, but personally I don't see how with the injector, coil, ECT, IAT, cam, crank, TB, etc. harnesses unplugged. I'm expecting the lighting bolt and the CEL to be illuminated.

I'll post more info in a few days as I continue to learn.

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2003 Ram
Arrington 426 stroker
TCI 727
FAST XFI
2006 Magnum R/T
Diablo
Flowmaster catback
Arrington heads/cam coming soon...
ARRINGTON POWER: When you're ready to get serious

But not for the '03. Let alone, I want the extra 02 sensors so I can get a more accurate reading from both banks individually, not both at the same time, or like with my headers, just the passenger side.