The Mishimoto 92-99 BMW 3 Series Aluminum Coolant Expansion Tank - Black is a performance upgrade for the cooling system of your BMW 3 Series. This tank is constructed from lightweight aluminum and features a black powder-coated finish for increased durability and improved aesthetics. This tank also features a larger capacity than the stock tank, allowing for improved cooling system performance and efficiency. The tank also features a no-spill design with an integrated overflow port, ensuring that you won't lose any coolant during operation. This tank is a great way to upgrade your cooling system and keep your BMW 3 Series running at its best.