Features: 1.In the field of high?performance driving, springs are still the best way to regulate boost. Whether your goal is a moderate 3PSl, 14PSl or a custom boost level, the spring can achieve. 2.Each wastegate actuator spring is designed to work individually or in groups, so you can mix and match different springs to get the best PSI. 3.By stacking up to three springs in your waste gate, you can achieve the desired boost speed and the horsepower you need. 4.It is exquisitely processed from high?quality low?carbon steel, has abrasion resistance, is not easy to damage, and has a long service life. 5.Has extremely high heat resistance, can cope with difficult environments, it is a good replacement on the market. Specification: Item Type: Waste Gate Spring_x000D_ Material: Carbon Steel_x000D_ Purpose: Turbine Waste Gas Valve_x000D_ 14PSI Spring:_x000D_ Initial Outer Diameter: Approx. 48.7mm/1.9in_x000D_ Initial Length: Approx. 105mm/4.1in_x000D_ 8PSI Spring:_x000D_ Initial Outer Diameter: Approx. 37.8mm/1.5in_x000D_ Initial Length: Approx. 62.3mm/2.5in PackageList: 2 x Waste Gate Spring