The PT76GTQ turbo is a big shaft race turbo equipped with a high flow Q trim turbine wheel designed to fit a Turbo Buick. It comes standard with a TO4S compressor cover with a 4" inlet and also features a 2.5" outlet for maximum airflow. It will support up to 950 HP with proper fuel and other engine modifications. We recommend a minimum 4000 RPM stall speed (based on a production 3.8L endine) If you need an adjustable actuator click the upgrade button to the right with part #628ACTUATOR (your stock unit will NOT fit without welding and or modifications)