<b>Installation:</b> <br> <br>1. Loosen the screw on the Turbo Sound Whistle <br>2. Place the Turbo Sound Whistle body inside the exhaust muffler with the larger opening facing the inside of the muffler <br>3. Screw the screws on the Turbo Sound Whistle to tighten the item so it doesn't fall off while driving <br>4. Professional installation is always recommended. <br> <br> <b>Notes:</b> <br> <br>1.This turbo sound is not suitable for extremly curved pipes, if curvature is minor,the fitting bracket mabe slightly curved to match the tail pipe. <br>2.Not suitable for pipes having smaller or bigger diameter than 37mm to 44mm. <br>3.For taill pipes with deflected outlet,it might be necessary to modify slightly the shape to allow installation. <br>4.Prior to the purchase and installation, please make sure that the interior of the tail pipe is suitable and sufficiently long(11-12cm) to contain the turbo sound device. <br>5.Periodically (after 500-800km) check and re-tighten the bolt and rock nut.