GSP Universal 50mm Gt-series Wastegate 12psi Spring Adjustable Project's 50mm GT-Series 4 Bolt Wastegate (universal application) - Includes a fully adjustable 12psi wastegate spring - Holds accurate boost pressure - Ultra durable diaphram - Includes all the hardware (bolts, gasket, etc) - High quality wastegaste similar to other more expensive options INSTALLATION: Installation manual is not included Professional installation is highly recommended