Wall Colmonoy Corporation in Oklahoma City manufactures its exhaust products under the trademarked name, Nicrocraft, and sells around the globe. Nicrocraft exhaust components are high quality, new manufacture, FAA-PMA approved, and carry a full 12-month, unlimited hour warranty from the date of installation, not the date of order. FAA Form 8130-3, Airworthiness Approval Tag / Authorized Release Certificate are available upon request.