We know this is a popular product released by RE Amemiya. This is an air separator tank for exhaust air bubbles (cavitation) that occur inside the engine, radiator body and cooling pipe through the scrolling effect. Since the genuine product is made of resin, it is often broken and we recommend replacing it as soon as possible.
This product is a Mazda RX-7 FD3S exclusive product. Please install it at a professional shop as much as possible. All installation is done by yourself. In addition, we do not accept any fees associated with installation or any other fees in any situation. Thank you for your understanding