For a street car that gets driven all the time and it is a colder area then it is a good idea. It helps driveability alot for that. It heats the intake to heat the incoming fuel-air mixture which helps alot in cold weather and it heats the choke well in the intake to heat the choke coil in that style intake. But most of us gearheads (me included) that drive our hot rods in the warmer months we dont want it. We want the cool incoming air charge as it is more dense and a cool fuel-air make more hp as it is heavier and will fill the cylinders more. And as most high performance cars can have heat soak trouble in warm temps it will make that worse in warm temps. So most muscle cars dont really need it unless its a year round driver.