Leading British automotive performance tuner Torque Developments International (TDI) plc today announces the release of a new, high flow intake plenum for the iconic Subaru Impreza STi.

Carefully developed to remove the performance compromises of the stock intake plenum, the Cosworth EJ257 version uses a larger internal volume allied to large tapered runners to offer a 10% flow improvement compared to the original Subaru unit.

Ideally suited to the needs of high power output EJ20 and EJ25 engines, the Cosworth EJ257 intake plenum is specially designed for use on Imprezas using an aftermarket front mounted intercooler. Easily installed as straight swap for the Subaru item, the Cosworth EJ257 intake plenum is directly compatible with 2004-2009 model year cars using the factory drive by wire electronic throttle body.*

Cosworth’s engineers have retained the stock throttle body mounting location, ensuring widespread compatibility with most leading brands of front mount intercooler kits, including Cosworth’s own recently launched FMIC kit for the GRB Impreza.

Key Cosworth Subaru Impreza EJ257 intake plenum specification highlights include:-

• Substantially increased plenum volume for high power applications

• Specifically designed for use with aftermarket front mount intercooler

• Large, tapered intake runners with radiussed inlets

• Tuned plenum volume, runner lengths and tapers

• 10% more intake flow compared to original Subaru version

• Integral vacuum manifold for easy connection to brake servo, boost gauge, MAP sensor etc

• Compatible with standard or forward mount throttle body installations

• Stock throttle body location retained

• Suits all Impreza STi’s 2004 onwards with drive by wire throttle body

• Direct replacement for original Subaru intake plenum unit

• Priced at £744.44 including VAT @ 15%

Carrying part number: 20006438, the Cosworth Subaru Impreza EJ257 high flow intake plenum is available now from principle Cosworth performance parts specialist and main distributor TDi-plc, priced at £744.44 including VAT @ 15%.

* With some rudimentary modifications the Cosworth Subaru Impreza high flow intake plenum could be utilised for EJ20 cable throttle body applications.