Perrin Drop-In Filter WRX / STI (2008-2018) LGT (2005-2009) Mazda Koyo's aluminum radiators for the

Koyo's aluminum radiators for the E30 and E36 3 series BMW are designed to keep your engine cool even under some of the harshest conditions

without any counting of clicks

making the ride variable from comfortable to sporty and stiff

Also included in this system is a filter restore kit

All Borla systems are backed by a million mile warranty

Perrin Drop-In Filter WRX / STI (2008-2018) LGT (2005-2009) Mazda Koyo's aluminum radiators for theThe Perrin drop in air filter for the Subaru WRX STI Legacy GT uses a 2 stage foam filtration element to improve airflow in your stock air box; providing improved power and airflow while removing harmful particles from the incoming air. Using a special oil coating, the foam filter catches dirt particles while allowing air to pass unimpeded through the high flow foam. This filter can be cleaned and re oiled using the Perrin cleaning kit, sold