Hks Ssqv Bov Flange Adapter + Blockoff Plug for Subaru Impreza WRX & STi Turbo Description: This flange adapter is the special "Slim" flange which will perfectly fit Subaru WRX (2004-2007) & STi (2004-2017) models, on contrary of the current thicker traditional flanges on the market which have a lot of fitment issues. Includes: One top intercooler mount (direct bolt on) HKS Flange Adapter for Subaru WRX (2004-2007) & STi (2004-2019) 1 x CNC Aluminum Billet Plug (also known as blockoff plug) (OD: 1.3")