I have an 02 which has the Trac system. 01,02 4runners they moved all the factory ABS stuff over to the right side connected to the master cylinder. only thing there, was the square plastic abs,trac,vsc relay box that I just moved over with out changing anything.
I think my setup was the best setup because I didnt have to cut the radiator shroud to fit 2 in the stock location or worry about running huge cable to the rear of the vehicle. I had all the metal from previous projects. I bought the 2 gage wire from harbor freight for $20
As for the Air pump I will mount a 2.5 gal tank up under the spare tire and use an autoshut relay so the pump can turn on and off when needed. Ill Run hose to the front and back of the vehicle with air connectors. Ill run a switch for the pump up front off the relay. I thought about the noise and heat but the other guy who did it seems to have good results with his setup.
His Setup
On Board Air (OBA) - Blank White Page