Hey Mike when you install your ztronics the easiest way to get the wires into the car is on the passenger side lay a drop light on the floor board after you pull out the glove box. Now remove the BCM 2 module. If you look at the fire wall under where the BCM was you will see a slot of light that makes it very easy to get the wires in. The wires leave the BCM Box on the driver side at the firewall. You can run your o2 harness in at the harness next to the firewall just insert a pair of needle nose pliers into the boot and spread it open then push the plug thru. Any other wires can go thru the same boot. Make sure you fuse your pwr wire within 6 inches of your connection. This is to protect the car not the ztronics.If you do it right when it is all done you cannot even see any of the wires under the hood.