SODIAL(R) Turbo Sound Whistle Exhaust Pipe Tailpipe BOV Blow-off Valve Simulator Aluminum Size S/M (S) After installed this product, the pressure blowing out of your exhaust will make your vehicle sounds like a turbo vehicle with the turbo system or blow off valve. Made of high quality aluminum, light weight and durable. Easy to install on the car's tailpipe. Material: Aluminum Package includes: 1 * Turbo Sound Whistle,1 * Small Spanner,1 * Screw