Originally Posted by
guntek18
I once saw a picture of someone's kit and on the side of the tank was the fuel line with what was a fuel, filter/cooler combo. it had several thin fins surrounding the center cavity ( just like a cooling head).
They are called gas coolers and some pros use them when racing. It just cools the air going into the fuel tank from the muffler. It probably does increase runtime alittle but its also said to reduce bog after refueling, so its kind of a 2 for 1 deal in terms of how they help.