keep water in them at all times trim it down when you light it up then cool em down so you dont end up with high doller black blue and rust headers the valve under the seat comes off the water neck (one only) to the valve then to the headers,the valve eliminates the need for restriction im still runnin the same ones since 1985 with 750 hp there gittin black & blue but only from doin 96 mph passes and keep the rubbers cool goin through the hull ,i might be seein paul from bassett tomarow hes a block away from my shop if any other questions