The factory throttle body inlet pipe is made of flexible rubber. Under increased boost levels, it will inflate and can even blow right off. When that happens, you either get a dramatic loss of performance and unfiltered air into the engine, or the car just stalls - depending on your engine management. Either way, it's bad.
This replacement unit replaces that rubber balloon with a polished stainless steel pipe. It has a 1 3/8" fitting for an upgraded bypass valve, so we recommend pairing it with our Turbosmart unit.