No. S is suitable for the displacement of 1.0-1.6, and the diameter of exhaust pipe port is-43mm <about 67G>

No. M is suitable for the displacement of 1.6-2.0, and the diameter of exhaust pipe port is 37-48mm <about 87G>

No. L is suitable for the displacement of 2.0-2.4, and the diameter of exhaust pipe port is 44-55mm <about 102G>

XL is suitable for displacement above 2.4, and the diameter of exhaust pipe port is 56-85mm <about 126g>

[Product description]]

Name: car modification turbine whistle exhaust pipe sounder imitation sound device turbine exhaust imitation sound whistle

Specifications: small, medium, large, large, 4 models

The above price is a small price, please contact customer service for other specifications!

Easy to install, beautiful and elegant, very fashionable, low cost, it is used to decorate my car.

This product has 4 models of small, medium, large and large size.

The length of the product is only the length of the whistle, excluding the length of the holder.
About Size Selection: first, please measure the inner diameter of your car's tailpipe,
compare with the size shown in the following figure, and see which one fits your own car;
on the premise of proper installation size, try to choose a larger size.
For cars with small displacement, you need to choose a larger one. For cars with large displacement, you can choose a smaller one. Because the principle of whistle sound depends on airflow. For cars with large displacement, the bigger the whistle is, the easier it is to make noise.