Boost is what creates heat. So sitting in traffic your car is basically Naturally Aspirated. You may get a bit of heat soak by sucking in the under hood air but I don't believe it would be anything to worry about. Maybe use 2 Hobb switches, have 1 Meth Nozzle kick in at say 2 PSI with a light spray and the other kick in at say 8PSI on a bigger nozzle. This way when you move the car 15Ft in traffic you can get it up on 2 PSI the meth kicks in and cools it off. This is just a thought and very inexpensive to do this.
Another thought is a Momentary switch on the Dash that bypasses the Hobbs switch and lets you spray meth at will. Kind of like a Fuel Dump Switch that the Motorcycle guys use to use so they would not go lean and burn up their engines. This would cool it off like right now whenever you seen the need.
