Depending on which manufacturer made your car, it may be quite a chore to drill through the metal cross brace that runs horizontally on the floor just in front of the seat. It can be done but as I said, it requires a lot of work. Beck cars use a nylon fuel line in the tunnel. Not liking that but wanting to keep the fuel line hidden, I drilled a much larger hole and ran -6 braided line to the engine then attached the AN fitting once the line was through the hole.. I also drilled the hole much larger and used a rubber grommet to keep the metal from rubbing against the stainless steel braid.