I apologize in advance if this question has already been answered. But I'm doing g the 4.6 to 5.4 swap on my 1997 ford expedition 4x4. I'm wondering which tuner or anything should I get in order to get it running great after doing the swap because I am using the 4.6 wiring harness and ecu.
No need to apologize. We have a few options for you: X4, LiveWire and iTSX. The custom tunes will be the same on each device, we will write each one specifically for you, your driving style, fuel type, mods, etc.
The X4 is a great option for plug and play. The LiveWire will show you live data you can monitor. The iTSX is a great option for cell phone/tablet tweaking. Just comes down to personal preference and what you like to see or not see.
As far as your swap goes, do you have the ECU for the 5.4? When are you planning on doing the swap?