Silver Turbo Sound Exhaust Muffler Pipe Whistle Blow off valve BOV Simulator Whistler Size L Universal Manufacturer Warranty is Valid for Purchasing from Astra Depot ONLY Package includes: 1 x Turbo Sound Simulator Whistle + Set of Mounting Tools. Thread Diameter: 6mm; Thread Length: 1cm; Tail Pipe diameter : 44-55 Displacement : 2000-2400cc Fit Most Automotive, Car, Vehicle with exhaust pipe diameter within 2.5" round. Color: Silver --- Material: Aluminum