The other one that got found out because a friend came over to help work on the car and then told one other person and away it went. Of course I said anything you see on this car, you don't speak of to ANYBODY, fell on deaf ears.
I was out and someone wanted to race. I said cool, set up the race and they wanted to see the engine. You can look at anything I had, but you don't touch anything in the compartment! I don't trust you or any of your boys, etc. Open hood, hand goes in and grabs the heater hoses right at the firewall. Got asked, Why would heater hose be just warm to the touch after a 30 minute drive and 180+ temps? DOH!!! Two weeks earlier the friend was at my place "helping". Quite the coincidence. Another hidden routing busted. Ran that for 3+ years. Had a fake plate on the car, I'll disconnect the hose or unplug wires at the solenoid if you want... anything to sell the illusion of it no longer being active.
I routed the fuel and nitrous lines inside the heater hoses with a pair of pass through tubes installed in the intake to get it under the plenum. Always nice to have family that was an aerospace engineer/fabricator handy for crazy thoughts and solutions. Fabbed a sealed box on bottom of intake to keep oil out of the solenoids. Oil was a big problem fouling solenoid seals when located in the block valley. Lots easier if the manifold had a heat crossover, weld/seal crossover at intake sealing surface shut, and open area below plenum. Made for more room.