Originally Posted by OldRice

Yes the solution actually works out really well. Additionally you can drill a 2" grommet hole with a 2" serrated hole bit in your dummy floor. Then go to Menards\HomeDepot and buy a black plastic desk grommet insert (pic). This will allow you to drop your bottle lines and wires into the spare wheel well vacancy.

Also piercing that factory rubber grommet in the upper left corner of your Z (where the wire loom is) will be your best method to run your primary N2O feeder line under the car, up into the engine bay, to pick up your solenoids.