(VG30DETT- Includes 2 Actuators, 10.0-15.6 PSI) Built for the (90-96) Nissan 300ZX... HKS internal wastegate turbo actuators utilize larger internal diaphragms than the original equipment actuators allowing quicker turbocharger spool up and boost stability. HKS upgraded wastegate actuators are for use with the factory turbocharger(s) and are a direct replacement for specific application.