A compressor bypass valve (CBV), also known as a pressure relief valve or diverter valve, is a manifold vacuum-actuated valve designed to release pressure in the intake system of a turbocharged vehicle when the throttle is lifted or closed. This air pressure is re-circulated back into the non-pressure end of the intake (before the turbo), but after the mass flow sensor. A blowoff valve, (sometimes "hooter valve" or BOV) performs the same task but releases the air into the atmosphere instead of recirculating it. This type of valve is typically an aftermarket modification. The blowoff action produces a range of distinctive hissing sounds, depending on the exit design. Some blowoff valves are sold with a trumpet-shaped exit that intentionally amplifies the sound. Some turbocharged vehicle owners can purchase a blowoff valve solely for the auditory effect even when the function is not required by normal engine operation. Motor sports governed by the FIA have made it illegal t
KOENIGSEGG People love to fawn over the the 1360-horsepower record-breaking Koenigsegg Agera RS , but Koenigsegg made a sister car that not many people talk about: The Agera S . It's a detuned Agera built for markets without access to E85 gasoline—the fuel the RS needs to make maximum power. Only five were ever built, and this one's for sale. Welcome to You Must Buy , our daily look at the cars you really should be buying instead of that boring commuter sedan . The Agera S uses all the same carbon fiber body and chassis pieces as the RS, as well as the same interior. The only difference is, the car's 5.0-liter twin-turbo V8 is tuned for standard 93-octane fuel rather than E85. Power numbers drop significantly, down to "only" 1040 horsepower and 811 lb.-ft. of torque. According to Koenigsegg's site , the S is still capable of over 400 km/h (248 mph). This particular car is a right-hand drive model, finished in matte bl