Turbosmart's springs are designed to work with our Plumb Back, Dual Port and Supersonic blow off valves. They offer a wide range of spring rates to suit your driving style and application. Turbosmart's springs are made from high-quality materials and are designed to maintain the peak performance of your blow off valve under the most extreme conditions. Choose from our selection of Turbosmart springs to get the perfect fit for your car and the best performance from your blow off valve. Spring - Suit Turbosmart Raceport BOV Range. 18 In Hg (As fitted to TS-0204-1101 & TS-0204-1102) 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