This exhaust features 2.5inch 304 stainless steel tubing and TIG welded mandrel bends for durability, quality and performance. The Audi TT exhaust is finished with 4inch polished stainless tips that improves the appearance of the car. Designed to improve performance, sound and appearance, this AP exhaust is a must have for any Audi TT owner. Utilizing factory mounts ensure a proper fit and easy installation. No body modifications needed for the dual exhaust outlets.