How big and how many cables? If you pull back the carpet in the driver's footwell, you will notice a large rubber boot where the steering column comes through the firewall along with several wire bundles. Unless you are running more than 2 1/0 you should be able to poke a hole in that boot and route the cable through there. Be careful not to nick any of the wires in the harness.
I have the same car, and that is about the only place to run the cable. Its really tight under the hood and behind the dash is even worse as I'm sure you are aware.
What color is your SRT?