uxcell Two Way Mount Uinversal Muffler Fake Turbo Sound Stimulator BOV 30mm Producte Name : Turbo Sound Whistler;Material : Metal, Aluminum Fit for Tube Inner Dia. : 30mm/ 1.2";Fit for Exhaust Pipe Thickness : 12.7mm/ 1/2" Screw Diameter : 6mm/ 0.24";Whistler Size : 63 x 30mm/ 2.5" x 1.2" (L*W) Total Length : 106mm/ 4.2";Color : Silver Tone Weight : 93g;Package Content : 1 x Turbo Sound Whistler,1 x Mini Hex Wrench + Screw