I'm going to install a subwoofer amp in my 06 Sonata. I'm looking for the easiest spot to route the power cable through the firewall. Can anyone point me in the right direction?

 

I'm not familiar with the Sonata, but I ran some wires from the engine compartment to the passenger compartment of the Elantra by removing the front left fender liner, running a wire from the area near the battery/fuse box in the engine compartment, into the fender, then into the body near the front left door hinge. There is a large harness bundle that goes in there; if the Sonata is like the Elantra, you can poke through the boot with your wire and tape it off good with electrical tape. The wire comes through on the inside near the driver's foot rest. I wrote a guide to installing fog lights in the Elantra. It as a lot of pics and will take a while to load, but here is a link to the part where I brought the wires into the passenger compartment:

http://www.dfwhyundais.com/diy/FogLi...html#Section1i