Car Size S 18mm Turbo Sound Whistle Muffler Exhaust Pipe Auto Blow-off Valve

Universal fits for most cars w/ A STRAIGHT OEM Muffler Exhaust, doesn't fit the ELBOW muffer. Easy installation Install on Aftermarket muffler, Catback, Axleback muffler it will not produce any sound 1" muffler tip for best effect (OEM Muffler) Made of light weight aluminum CNC Machined from 6061 T-6 Aluminum. 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. Note: For vehicles with small displacement, choose a large one, and a large displacement, you can choose a small one, because the principle of whistle sound is by airflow, the displacement is large, the bigger the whistle, the easier it is to make a sound. The size of the sound is different depending on the specifications. The larger the number, the louder the sound. It is best to confirm the inner diameter of the exhaust port before purchase. If the whistle diameter is greater than or equal to the inner diameter of the exhaust pipe after adding 1CM, it will not be installed. At the same time, please note that the size of the sound is also related to the thrust of the exhaust and the personal feeling. After installation, the sound feels too big or too small can not be used as a product quality problem. It is possible that the individual models have small thrust or modified tail drums. The sound is very small or no sound, such a situation can not be used as a quality problem, please know! The last key point: the sound is not like, it is good to listen, this has a lot to do with personal feelings and hobbies!