These gas cooler are a good hop up for any Nitro car. It isn't as long as the ones you normally see for sale, but it still does the same thing. It basically goes between the fuel line that goes from your tank to your exhaust. Because the exhaust gas that gets blown into that fuel line and into your tank to give your tank prssure to push the fuel into your carburettor, the gas is Hot and when it keeps being pushed into the tank with hot expel gas, it warms your fuel which makes your engine burn more fuel and hence you get lesser run time. With this item on your vehicle it basically work like a intercooler. It spins the gas inside like a tornado and cools the gas down which inturn dont heat your nitro fuel as much will give you longer run time. the price for this item is reasonable and the q..