Round filters

Round filters are used in many different types of intake solutions where a simple, compact and functional setup is wanted. They are an obvious choice for standard cars, modified road cars, classic cars, motorsport projects and custom builds, where space, installation and airflow play an important role. In this category, you will find round air filters for many different needs, whether you are looking for a replacement filter, an upgrade or a custom solution.

A round filter is a popular solution because the shape often makes it easy to install in many types of engine bays. Round filters are used on classic carburettor setups, older engines, custom-built intake systems and universal solutions, but they are also seen in many other projects where a simple filter solution with good function is wanted. The shape makes it possible to find filters in many sizes, heights and diameters, making it easier to adapt the solution to the available space.

In practice, round filters are often chosen based on dimensions, connection type and application. Some are used directly on carburettor or throttle body setups, while others are used as universal air filters in custom projects where a bespoke intake system is being built. It is therefore important to choose the filter based on internal diameter, filter height, outer dimensions and the space available around the filter in the engine bay. On many cars, it is not enough that the filter simply fits the connection – there must also be room for engine movement, heat shielding and other components.

When choosing a round filter, it is not only about appearance. The size and construction of the filter affect how much air it can handle. A filter that is too small can become a restriction in a setup with higher airflow demand, while a larger filter will often provide better conditions for stable airflow. At the same time, the filter still needs to suit the specific car and the way the intake system is built. That is why it is an advantage to look at both filter type, dimensions and the overall application before choosing.

Round filters can be used both as a replacement for an existing filter and as part of an upgrade where a different intake setup is wanted. This can be relevant for everything from classic cars and converted engines to tuning projects and motorsport, where different carburettors, intake systems or custom parts are used. A round filter is often chosen because it offers flexibility and many possibilities in the build.