Cosworth High Volume Inlet Manifold for Subaru Impreza WRX STI 2004-2008

The Cosworth Subaru High Volume Inlet Manifold is cast from aluminum featuring large tapered runners with radiused inlets improved flow. Plenum volume been substantially increased tuned power. Engineered easy installation is key to making power. Cosworth EJ257 plenum is designed use with 2004-2009 engines equipped with electronic throttle control. plenum is designed use with cable-actuated throttle body EJ20/25 applications. This plenum is designed to replace factory Subaru plenum in vehicles equipped with an aftermarket front-mounted intercooler (FMIC) kit. Throttle body position remains stock; ensuring fitment with brand FMIC kitsigned the stock throttle body intake manifold. 2008-2009 Subaru STIs Cosworth FMIC (p/n 20005378) is highly recommended.
Features
Substantially increased plenum volume
Large; tapered runners with radius inlets
Tuned plenum volume runner length/taper
Over increase in flow
Integral vacuum manifold connection of brake booster; boost gauge; sensor; boost controller; etc.
Will work with standard or forward mount electronic throttle body configurations
Stock throttle body location compatibility with most aftermarket FMIC kits