Borla's STI header is constructed from T-304 stainless steel to give you the best in performance and durability. Borla's header will increase low end torque and throttle response through out the RPM range. Borla products are backed by a million-mile warranty, so this is the only header you will ever have to buy for your STI. This header is designed to bolt directly to a stock or aftermarket uppipe; we recommend changing the gaskets for a leak-free installation.