HKS SUH409 Equal Length EJ25 Turbo Exhaust Manifold | Impreza WRX STI (08-21) (14019-AF002)HKS Equal Length Exhaust Manifold Part #: 14019 AF002 Overview The HKS SUH409 Equal Length EJ25 Turbo Exhaust Manifold is a high performance upgrade designed specifically for Subaru EJ25 engines, including models such as the Impreza WRX STI from 2008 to 2021. Crafted to replace the OEM header, this exhaust manifold features a 4 1 design that enhances exhaust flow, supporting improved spool and overall turbo response. It is ideal for enthusiasts