Specifications: Make your car sound like a turbo vehicle with the turbo system or blow off valve. Easy to install, no welding or drilling needed. Installation: 1. Loosen the screw on the turbo sound whistle. 2. Place the turbo sound whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler. 3. Screw the screws on the turbo sound whistle to tighten the item so it doesn't fall off while driving. 4. Professional installation is always recommended. Type: Whistle Material: Stainless Steel S Size Diameter: 18mm/0.71", 102mm/4.02"  (Approx.) M Size Diameter: 23mm/0.91", 102mm/4.02" (Approx.) Features: Lightweight, Durable, Useful, Easy to Install Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Whistle Women warm headband with solid color, knotted and wide edge design can perfectly match your winter dress for travel, lover dating and family party. You can get a decor which is skin-touch, fleece lining and can be comfortable to wear for keeping you warm in winter with the help of this head wrap. Made of soft warm woolen acrylic material, it can be stretched without deformation. Handcrafted knit ear warmer headband matches well with your winter outfits so you and your family stay warm all autumn winter long. The length of this product is 24.5cm and width is 10cm. Wonderful winter headband is suitable for women wearing while skiing, snowboarding, skating, sledding, snowshoeing, camping, hiking or any outdoor winter sports and activities. Stay warm but look trendy during the cold months in this knitted hair band.