Kooks products are 100 Percent Manufactured in the USA. Kooks Headers and Exhaust make the most power in the industry, specifically designed for maximum power. Kooks products are made of T-304 Air Craft Quality Steel and come with a limited lifetime warranty to the original purchaser. Every Kooks product is dyno and race tested. Kooks is 3 generations of being family owned and operated. They deliver a designed, engineered and manufactured component of over fifty years of dedication and passion into the craftsmanship of what they do.