Headers on need help now
Even if there was something wrong with them, I don't believe either of these could cause the car to try to start on its own.
Your problem definitely lies somewhere with the starter.
Did the starter get dropped during disassembly or reinstallation? Or maybe the two connections at the starter are somehow touching each other and creating a circuit?
You'll just have to do some investigating and see what you find.

Good luck, man.
The wires that were ripped out are for the Oil Level Sensor.
Obviously, because you stated you now have a "Low Oil" Light illuminated on your Instrument Panel.
I don't know for sure if this can effect the way the engine performs. I wouldn't think it should, but I'm sure some one else will chime in to answer that one.
Either way, you definitely want the wires reinstalled into the connector so the sensor can work properly.
You will probably need to disconnect the connector from the sensor and take apart the plastic housing. This way you can properly reconnect the wires to the appropriate prongs inside the housing.
Once this is complete, your "Low Oil" Light should go away. (Provided you have the proper amount of oil in the pan. LOL)
Also, just an FYI, you may not want to drive the car for too long with open headers. I know it sounds badass, but with the placement of the front O2 Sensors in the Collectors and the open air just 3-6 inches away, the sensors will pick that up and translate a false reading to the PCM the amount of air in the exhaust. The PCM will then tell the injectors to start delivering greater amounts of fuel in an attempt to compensate. This will give you shitty mileage and less performance. Get yourself a nice Y-pipe & Catback or fab-up your own custom True Dual System and you should see a significant gain in performance.
Thats all I got, man.
Hope this helps.






