Behind the e-brake there is a small oval shaped grommet under the carpet, (or mat) on my SS where I ran wig-wags through. I'm assuming yours would have it too. As far as getting all the wires through, that may be a different story...
"Where can I can I run alot of wires through my firewall on my caprice for siren, wig wags, strobes, take down lights, and dash strobes?"
You better check your state law's before installing the siren and any kind of strobes. To be honest, I think your going EXTREMELY OVERBOARD dude... Aren't you the same cat that installed a "fake keyboard" in your car???? ALL of that stuff your planning on installing is illegal in Texas, don't now about Canada(unless your a firefighter/EMT/LE of course) Are your trying to look like an undercover cop to get out of ticket's?? Trust me, it’s NOT kewl looking like a cop, because your car will draw a BUNCH OF ATTENTION that you don't want. But I'm not trying to flame you, just some constructive criticism. Take care, and be safe!
ya these cars get enough unwanted attention as it is. the ones that do pull me over treat me like im impersonating an officer and i thought the SS grille white letter tires made it blatantly obvious that its exactly what im trying NOT to do. granted i do have a CB w/ whip antenna and my push bars looks like cop things but i use this as my tow vehicle and have to push other cars on regular basis and communicate with my uncle when we make runs to pick up/drop off cars.
Pull back the carpet, and the piece of rubber under it. You cant miss it is right under where the AC drains through the firewall. I dont know if this came on all Caprice/Impalas for sure, but there is one on mine. Unless the highway patrol added it to mine, because it is where they had their wires run through at.