Building an engine capable of extreme power requires a large
amount of air to be able to make it's way into the combustion chamber.
Even with increased cylinder heads, cams, valves, etc. you can only
pull in what the manifold will allow. If it's time to upgrade your
intake manifold and you are looking for perfection, Cosworth's high volume
manifold is your best option.
This High Volume Inlet Manifold is cast from aluminum featuring large
tapered runners with radiused inlets for improved air flow creating a
substantial increase of Plenum volume significantly increasing power
capabilities. These have been engineered for easy installation and
feature an integrated vacuum manifold with connections for your brake
booster, boost gauge, MAP sensor, etc.
This manifold is designed for the EJ257 with STI engines fitted with
electronic throttle control and is not designed for use with any
cable-actuated throttle body EJ20/25 applications. It has been
dynamically built to be compatible with standard or forward mounting
throttle body configurations and by maintaining the stock throttle
body location, this manifold will be compatible with most aftermarket
front mount intercooler kits.