Item Name: Muffler Pipe Roar Maker Sound Car Turbo Exhaust Pipe Sound Simulator Whistle. Product main material: aluminum alloyProduct size: S M L XLProduct color: blackApplicable models: universalColor: BlackSize : S: suitable for 1.0-1.6 displacement, exhaust pipe diameter 37-48 mmM: suitable for 1.6-2.0 displacement, exhaust pipe diameter 44-55 mmL: suitable for 2.0-2.4 displacement, exhaust pipe diameter 56-85 mmXL: suitable for 2.4 or more displacement, exhaust pipe diameter 85 mm or moreFeatures:Made from light weight aluminum material,lightweight and durablemake your vehicle sounds like a turbo vehicle with the turbo system or blow off valve.Universal fits for all vehicle with right size.Easily installed on the car exhaust tailpipePerfect match and make your car fashionable and unique.Installation: Loosen the bolt on the Turbo Sound Whistle.Insert the the Turbo Sound Whistle into the tailpipe.Tighten the bolt so as not to fall off while driving.Package Includes:4 * Sound Whistle Simulator *