drive by wire question
Im not sure about 2004 but some of the later PCMs don't have drivers in them for the cable throttle so you have to get another PCM if you want to go cable. You'd also need to modify the harness (or buy one) to have the discrete connectors for the IAC, IAT, TPS.
Good luck
You could probably go through a lot smaller hole to the engine bay if you de-pinned the connector and reconnected it on the other side of the firewall. Probably a 3/8" hole in a smaller grommet.
My pedal assemby is going in a Jag, so I can't answer your question about a Camaro. I'm going to have to modify mine - I'm not anticipating it to be too difficult


