In case this is a new term to you, a swirl pot is a small reserve tank that supplies fuel to the fuel pump during hard cornering. The stock TR6 fuel tank is not baffled so during a long hard left turn at low fuel levels the pump may starve for fuel. Not really necessary unless you are a very serious autocrosser or run on fumes all the time. A swirl pot can be be added just below the tank and a vent line run back up to the top of the fuel tank. Homemade pots are sometimes made from aluminum air conditioning filter/driers.