Product Name: Turbo Sound Whistler; Material: Metal Color: Silver Tone; Package Content: 1 x Turbo Sound Whistler ，1 x Mini Hex Wrench + Screw Net Weight: 137g; Whistler Size: 82 x 33mm /3.2" x 1.3" (L*Dia.) Screw Diameter: 5.5mm0.2"; Fit for Exhaust Pipe Thickness: 12mm/0.47" Whistler Inner Dia: 30mm/ 1.2" This muffler whistler is used to give your exhaust that sporty whistling sound. Make your vehicle sound like a turbo vehicle with the turbo system or blow off valve. Universal fitment for all vehicles models. Made from light weight aluminum.