Turbosmart's WG38/40 3psi Black Inner Spring is a must-have for external wastegate setups. This spring provides the ideal boost pressure for any turbocharger, ensuring consistent and reliable performance even under extreme conditions. Turbosmart's design ensures that this spring will last for years, providing maximum performance with minimal maintenance. With Turbosmart's WG38/40 3psi Black Inner Spring, you can trust that your engine will perform as expected every time you hit the gas pedal. Ensure your setup is up to spec with Turbosmart's best-in-class external wastegate spring. Behind every Turbosmart product stands a long and rich racing history. While a majority of Turbosmart products are used on street cars, their design and testing procedure is identical to the high-end purpose-made racing products. Before reaching the consumer, Turbosmart products are subjected to a range of tests performed in the most demanding environment, the race track. Universal