If you want to tuck the harness you might have to extend the wires to the injectors and intake manifold sensors, you might be able to get away with de-looming it and removing the hard plastic harness guards. I guess if you're into looks it's pleasing to the eyes but functionality wise you're putting the wiring harness where it was never intended to be and risking damaging your car. Exposing the wires to excessive heat, oil, coolant, damage from rubbing against the manifold / engine. There's also a chance that the wires you cut / extend might also come loose or ground out against something. Like someone else said earlier having a spare harness is a good idea. If you can tuck it and get away without a major headache then more power to you, but for the average enthusiast it isn't really something worth doing simply because of all the potential problems it can create.