2004 best area to drill through firewall | Ford Thunderbird club group 1955-2005 T-Bird models

2004 best area to drill through firewall

What kind of wire(s) are you trying to pass through the firewall that would require a new grommet? I've always used the existing factory grommets on various cars.
 
My projects are designed, tested and partially installed. To complete, I need access from the engine bay to the interior. I will share details once complete.

For now, I was an engineer prior to retiring and now I have time to devote my knowledge to my passion, cars. We bought our vintage mint green in 2012 but I have not touched her as she was my wife's transportation. She will be retiring in a few years and she wants nothing more than to keep her car through retirement, BUT she's driving the wheels off. It now has 170k + miles. She will not settle for any other car, even the color. So a few months ago, we purchased another with very low miles. It is in perfect condition and this one will not be used as daily transportation. As such, I decided it's time to make it unique by adding a few of my mods. They are nothing gaudy or visual. It will remain stock looking. I specialize in electronics and if I have an idea, newly thought of or even something I've completed on another car (like both of my 2008 GT500s or my HSV Maloo), I can design, test and install. All unique stuff you've probably never seen.
 
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