PERRIN Equal Length Header 02-14 WRX 04-21 STI USBM 984 2009 221

984 2009 221

This ECU will support up to 4 Channels of fully sequential Fuel and Ignition

fuel trims

Depending on the turbo size a 1/2 sized radiator may be required along with custom radiator pipes

7MM 4340 121

PERRIN Equal Length Header 02-14 WRX 04-21 STI USBM 984 2009 221PART DISCONTINUED! LIMITED QUANTITIES 2. 0L WRX engines will require 2. 5L STi oil pans to avoid fitment issues during install. The PERRIN equal length header comes with collectors that are designed to increase overall airflow. This precise construct will creates an increase in reliablitly and power, while significantly changing the tone of the exhaust note. This Header has been created to bolt on and go, without tuning required to safely use this