You can run the airlines inside the car along with the harness, or under the car. For the under install, I've seen people tuck them inside the plastics by the side skirts, so they stay hidden away from the elements and road. This is the road I will be going as it makes for simpler fix if a line goes bad, i dont want to deal with having to take the car apart on the inside to fix or replace a line. I will install the harness inside though, through the trunk/sides and into the front firewall by the battery
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