Running meth line thru firewall

[Frogger]

I'm in the process of running water meth line from my trunk to engine bay via the cabin. Where is the best place to breach the firewall ?

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[Edwin]

You may actually want to read through the infotainment and electronics section at some of the subwoofer installs. There are two ways to get through that I know of. Theres a rubber grommet under the glove box that will lead into the wheel well and then you can rout the water line up through a hole in the frame that will have your cable coming out near your battery cover. There's also a grommet on the drivers side that will lead directly into the engine bay but it comes out into the metal box located under the brake fluid reservoir. You'll have to use a wire or something else to pull your line through and directly upward through the opening since you can't reach the grommet from inside the engine bay.

Or you can always use a step bit and make your own way through...