The Acousta-Fil Boa is designed differently than traditional muffler wadding where the desired amount is filled, it expands to fill the space once subjected to ambient heat. This latest Boa version of the exhaust gasket is supplied in a long feather boa-like length (hence the name), making it even more versatile than the foil type, allowing for oval or intricately shaped fill more effectively.
The boa only needs to be loosely wrapped or packed in a muffler as it expands to fill the voids when subjected to exhaust gas heat, ensuring optimal sound absorption.