Like a NOS setup except the pssst, psssst is for cooling, not clearing the NOS lines? All the kids would think you want to race. The scary thing about rapid cooling of hot parts is that they tend to distort and sometimes break. I had a cooling air setup on my injectors for a while, with a hose with holes in it to direct air on to each injector. It worked great but I had to twist a timer dial every time I stopped the engine. Keeping them cool, instead of cooling them after they got hot. A turbo timer would probably work. It was a lot of complexity though. The aluminum fuel rail and the insulation of the injectors seems simpler. A timer on the fuel pump do the trick. Keep the cool fuel running through the rail. I had pondered that but never tried it. Leaving the fuel pump running with the car unattended bothered me, plus heating the fuel in the tank. I also thought about running a line from the coolant system over the injectors with an electric water pump, but air was easier. The situation is just aggravating, overall.