There is no definitive answer to this question as it depends on the specific vehicle and the specific K&N air filter. Some vehicle manufacturers do not allow any aftermarket modifications that could potentially affect the warranty, while others are more lenient. It is important to check with the specific manufacturer to find out if installing a K&N air filter will void the warranty.
K&N air filters are designed to be a direct replacement for the factory air filter, and they are often less expensive than the stock filter. They are also easy to install, and most can be replaced in just a few minutes. K&N air filters are made from premium materials that are designed to provide superior performance and filtration.
Overall, K&N air filters are a great option for those who are looking for improved performance and filtration. They are also a more affordable option than the stock air filter. However, it is important to check with the specific manufacturer to find out if installing a K&N air filter will void the warranty.