i used cool tubes the same as what you are talking about,they offer more surface area,so a little more cooling,i drive my car alot in 90 degree plus heat.
but the way they hook up to the radiator,water pump, is with rubber hose,and after some time mine began to leak,
and also if you happen to touch one of them when they are hot they will scald the hell out you
and i really dont think they kept the car any cooler, they seemed to radiate more heat under the hood