Perrin's equal-length header creates a smooth sounding exhaust note while increasing horsepower. Most headers collect on the passenger side of the engine and due to space constraints are not equal length and compromise exhaust flow.
The equal length (EL) version gains you even more power, but the boxer sound will be gone. Note that the equal-length header will NOT fit with the stock EJ20 (2.0 liter) oil pan. You'll need an EJ25 (2.5 liter) oil pan. The unequal-length header fits either oil pan, listed here .The equal length header will not fit 06-07 WRX, and will not fit Forester XT, because of a slightly different oil cooler design.
We recommend also installing invidia up pipe at the same time. Looking for heat shielding? Try our exhaust wrap kit, and/or our Mach V EJ Header Heat Shield.
Space is tight, so check our notes about fitment below;
Fits 2002-2014 Subaru WRX and 2004-2020 STI, but check fitment table above. Also fits EJ-motor turbo Legacy/Outback and Forester models.