Specifications: Specifications: Color: Silver Material: Aluminum Alloy S Fit for 1.0-1.6(car displacement) 32-43mm(tailpipe dia) M Fit for 1.6-2.0(car displacement) 37-48mm(tailpipe dia) L Fit for 2.0-2.4(car displacement) 44-55mm(tailpipe dia) XL Fit for above 2.4(car displacement) 56-85mm(tailpipe dia) 1. Small displacement(Car), suggest to choose a larger size;(Please be sure the larger size aslo fit your car.) 2. Large displacement(Car), suggest choose a smaller trumpet, whistle sound(Please be sure the smaller size also fit your car.) 3. Due to the principle of airflow, large displacement, the larger the whistle, the easier it will sound. Installation: 1. Loosen the bolt on the Turbo Sound Whistle. 2. Insert the the Turbo Sound Whistle into the tailpipe. 3. Tighten the bolt so as not to fall off while driving. Note:The product is only suitable for direct exhaust pipes, and the bent exhaust pipe cannot be installed. Not the sound of a sports car! Is the sound of the flute Package list: 1XAuto-Grip Car Sound Maker+1X TOOL