The Corsa Captains Call Silent Choice Boat Exhaust is a high-quality aftermarket part designed specifically for boats equipped with inboard engines. Manufactured by Corsa, a trusted brand in the marine industry, this exhaust system is designed to reduce noise and increase performance on the water. With its innovative technology and durable construction, this product ensures a smooth and efficient exhaust process, making it an essential component for any boat owner looking to enhance their boating experience.These are being sold as is . They are in good condition. Stainless Steel Fresh water use. 4 inch. Im selling for parts because the flaps are missing which i understand can be purchased at Corsa. mercury bravo .