So I'm swapping an early 5.7 into an 02 dakota. I have the wiring harness from a 03 4.7 v8 that has the correct plugs for the NG ECU but I'm going to be mainly taking this truck to the track and I don't want to use catalytic converters can any of the stock ecu's be used without cats? I have several that I've pulled at U-Pull yards. I have an 03 ram 2500, an 04 Durango, and an 05 ram 1500 ecu. Would any of those work or am I going to have to go to an aftermarket ecu?
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The 05 ram is your best bet. 03 ram stinks and isn’t very tunable. 04 Durango is CAN based so not a good choice for you