Turbosmart • MSRP: $499
The Turbosmart Kompact Dual Port kit for BMWs features two dual-port or plumb-back bypass valves. It includes all the fixings, such as hoses and clamps to replace the plastic factory bypass valves. The Turbosmart valves offer better boost response without the worry of leaks. They were specifically designed for the current N54 twin-turbo engine found in the 135i, 335i, 535i and Z4.