There is a hole in the firewall where the hood release cable goes through. Bust out a 1/2" drill bit and open it up some more. Then get a big rubber grommet or some other sealant to put a ring around the hole.
1992 Eagle Talon TSi - sold (POS)
2002 Mustang GT - sold
2002 SVTF - sold
2008.5 Mazdaspeed3 GT - cursed
2003 350Z Track - basically stock, and it runs