I almost did this to my 83 300SD when i bought two new(used) seats complete with the computers for 200 bucks. The main deciding factor for me was i did not want to run all new wiring harnesses, and i was the only person that drove the car, so what did i need them for? at the bare minimum, you will need the computer, new switch, and the wiring harness. You may need to re-wire the seat as well. I agree, not worth it
96 integra SE....sold
99 a4 quattro....sold
2004 highlander limited....current.