Smaller and lighter than other manual boost controllers on the market. Set your boost and forget it. Boost adjustable from under the hood with an accurate, proven detent system. Easy to install and adjust. The Turbosmart Gated Boost Control Valve range is one of the best dollar for horsepower upgrades that you can make to your turbocharged engine. All Turbosmart Gated Boost Controllers feature their exclusive gate feature which minimizes wastegate creep and can improve turbo response by up to 800 rpm earlier in the rev range - this means that you can increase the performance and response from your engine without even raising the maximum boost level. Stable increases in boost over wastegate spring pressure of 200%+ for internal wastegate and 100% for external wastegates are common practice using this manual boost controller. Manufactured from high-grade brass and billet aluminum and are renowned for their easy installation, robust design, stability and the exclusive detent adjustment system allows for accurate and simple tuning of boost pressure. The Turbosmart Gated Boost Control Valve range is ideal for mildly modified turbocharged engines and perfect for increasing boost levels on factory turbo cars and turbocharged engines. Please note that one turn (click) of the knob does not correspond to 1 PSI change in boost.