SUS Power LM panel filters are direct replacements for the standard panel filter, they fit straight into the standard air filter box and improve airflow into the engine whilst still offering very high levels of filtration. They will also not need replacing as frequent as the original factory element.
Direct fit for:
WRX STI VAB, EJ20, 08/14>
WRX S4 VAG, FA20, 08/14> Imprezza S-GT, GH8, EJ20T, 07/07>
Imprezza STi, GRB, EJ20T, 10/07
WRX STi VAF, EJ25, 08/14>