Borla's 02-09 WRX & 04-09 STi header is constructed from T-304 stainless steel and ceramic coated to give you the best in performance and durability. Borla's ceramic coating protects your manifold from rust and corrosion and reduces heat loss for improved performance. Borla products are backed by a million-mile warranty, so this is the only header you will ever have to buy for your WRX or STi. This header is designed to bolt directly to a stock or aftermarket uppipe; we recommend changing the gaskets for a leak-free installation.