I want to run a 3/4" o.d. hose from the engine bay driver's side into the passger compartment then to the trunk on my 300D. Are there existing holes in the firewall that are unused that are covered up with plugs? If not where's the best place to drill? The hose will be run along the floor onto the trunk.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked