uxcell 11cm Long Turbo Sound Exhaust Muffler Pipe Blow Off Valve Simulator Whistler Product Name: Turbo Sound Whistler; Dimension: 11 x 6 x 3.3cm/ 4.3 x 2.4 x 1.3 inches(L*W*H) Material: Metal; Color: Silver Tone Package Content: 1 Pcs x Turbo Sound Whistler; Whistler Inner Dia.: 27mm/0.81" Screw Diameter: 4mm/0.16" Whistler Size: 30 x 15mm/ 1.2 x 0.6 inches(L*D)