Euro Style Turbo Sound Whistle Muffler Exhaust Pipe Valve BOV Simulator L For BMW Audi Volkswagen Chevrolet Silver Package includes: 1 x Turbo Sound Simulator Whistle+ Set of Mounting Tools Size: Length:4.38"(11cm); Diameter:1.19"(3cm); Thread Length: 1cm Material: Aluminum Color: Silver Fit Most Automotive, Car, Vehicle with exhaust pipe diameter within 2.5" round.