Killer B Motorsport 4-1 Holy Header w/EGT Bung 2-Bolt Coated Subaru EJ Models (inc. 2002-2014 WRX /

The Killer B Motorsport 4-1 Holy Header is made from 321 Stainless Steel and features a Swain Coating for enhanced heat and corrosion protection. Designed with a symmetrical 4-1 configuration, short equal-length primaries, and a 2.5\" secondary, it aims to improve transient response, reduce turbo lag, and enhance throttle response. It incorporates a cast collector made from 347 (321 stainless) with a high-velocity merge design. This header is engineered to work around the oil pan to help reduce oil temperatures. It includes an EGT bung on cylinder #4 and is compatible with any 2-bolt up-pipe design, including some rotated setups. Killer B Motorsport ensures quality through inspection, assembly, and pressure testing, and the product is made in the USA.