It allows your car to idle without the key in it. That allows the coolant to continue circulating and cool the turbo. You don't need one as long as you let your car idle for a minute or two before you turn it off. But it's nice to have so you don't have to sit there and wait.
Either the Greddy or Blitz. They have a built in boost gauge. Other than that, they all work the same. Just depends on which one looks the best to you. Make sure you get a wiring harness. They all use the same plugs, so the HKS harness most people sell will work.
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