For cars with small displacement, choose a larger one, and for cars with large displacement, choose a smaller one, because the sound principle of the whistle depends on the air flow. For cars with large displacement, the larger the whistle, the easier it is to make noise. S is suitable for displacement of 1.0-1.6, exhaust pipe diameter of 32-43mm < about 78g > m is suitable for displacement of 1.6-2.0, exhaust pipe diameter of 37-48mm < about 87g > L is suitable for displacement of 2.0-2.4, exhaust pipe diameter of 44-55mm < about 102G > XL is suitable for displacement of more than 2.4, Exhaust pipe diameter 56-85mm < about 134g > [product introduction] product name: exhaust pipe whistle, car whistle, throat drum, modified imitation turbine pressure relief sound product color: silver gold, black and blue

[careful shooting of double row nozzles]

Pronunciation principle: the whistle of pressure relief sound, the whistle clamped on the exhaust pipe, makes it sound through the air flow of the exhaust pipe.

Installation method:

1. Loosen the bolt on the turbine whistle.

2. Insert the intake and exhaust pipe of turbine whistle.

3. Tighten the bolts so that they do not fall off when driving.

Note: different specifications make different sounds. The higher the number, the louder the sound. Please confirm the inner diameter of the exhaust port before purchase. If the whistle diameter plus 1cm is greater than or equal to the inner diameter of the exhaust pipe orifice, 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 personal feeling. The sound that is too large or too small after installation can not be regarded as a product quality problem. For some models, because the exhaust thrust of the original vehicle is small or the tail drum has been modified, the sound may be very small or no sound. Such situations can not be regarded as a quality problem, please know! Finally, key tips: whether the sound is like or not, whether it sounds good or not has a lot to do with personal feelings and hobbies. Unexpectedly, this is also an imitative sound. Please take it carefully if you mind.

The whistle can be heard by blowing hard with your mouth close to the air inlet. What can blow is that the product is normal. What can blow but cannot sound after installation is the problem of automobile exhaust thrust.

Check and retighten the bolts regularly.