fuel saver,power saver 1)for diesel cars 2)High quality ... the vacuum tube, it can save 10% -25%, increase power at 20%,reduce emissions at 50% -80%, to reach ... detect air flow.Notice that when installed between the vacuum brake booster and the engine, it should near to the engine ... cushions, installed on the vacuum tube between automobile Vacuum brake booster and engine, or on the PCV valve.2, for ...