Electronic boost control systems are available as aftermarket stand-alone systems such as the HKS EVC and VBC , Apex-i AVC-R , GFB G-force , or Gizzmo IBC / MS-IBC as a built-in feature of modern factory turbocharged vehicles such as the Subaru Impreza WRX STi and often as built-in features in full aftermarket stand-alone engine management systems such as the Holley EFI , Hydra Nemesis , AEM EMS and MegaSquirt .
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