Catch cans are devices that are installed in vehicles in order to collect oil and other fluids that may leak from the engine. Catch cans typically do not require a tune, but there are a few exceptions. Some catch cans are designed to work with specific engines and may need to be tuned in order to function properly. Additionally, some catch cans can affect the way an engine runs if they are not installed correctly. If you are unsure whether or not your catch can requires a tune, it is best to consult with a professional mechanic or the manufacturer of the device.