This HKS turbo exhaust manifold is an OEM replacement for the Subaru WRX (2002 - 2014) and STI (2004 - 2021). It's made of 409 stainless steel, designed to optimize exhaust flow and boost spool. This leads to increased horsepower and torque, while reducing turbo lag. It produces an aggressive exhaust note. The headers work with 2 - bolt flange up - pipes and come with new gaskets, hardware, heat wrap, and worm clamps. Note that 2004 - 2007 STI models have the same oil pan. 2002 - 2005 WRX models need an STI oil pan, and 2006 - 2007 WRX models require an STI oil pan and oil cooler. Lighter and more efficient than the factory manifold, it's a great upgrade for your Subaru.
Using this HKS exhaust manifold is simple. First, make sure your Subaru WRX or STI meets the fitment requirements as noted. If your model needs an STI oil pan or oil cooler, install them before putting on the manifold. When installing the manifold, use the provided gaskets, hardware, heat wrap, and worm clamps. Ensure all connections are tight to prevent exhaust leaks. As for maintenance, regularly check the manifold for any signs of damage or loose connections. Keep it clean to avoid corrosion. If you notice any strange noises or a decrease in performance, it might be time to inspect the manifold more closely.
