chevydoo

okay so heres the thing im looking at installing two 10" pioneer subs into my 2014 Silverado high country that has the factory bose system with amp and sub. the video and from what I can tell where everyone has run there power wires for aftermarket sub through the grommet on the firewall already has a large cluster of wires going through it so im assuming that ill need to find another spot to come through at. I have heard that I can also run the wires down the passenger side frame rails and through the back venting ? not sure how to do this any tips ??? or suggestions ? ive seen lots for the slt's but nothing on the high country and it just seems like their is more wiring etc. under the hood of my truck going to different places.