Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Neon Yellow) subaru-ascent-2019 The included billet turbo adapter

The included billet turbo adapter and 5-ply silicone make for a straightforward and leak-free installation and are compatible with both the factory bypass valve and COBB LF BPV

68 AHR Firewall Bushing (Rear)

but because when they’re compressed

these inlet and outlet sizes were chosen to ensure the perfect balance of flow and to maintain the boost in your system

showing a 12°F temperature drop as well as a +6 whp and +8 wtq bolt-on power increase for our stock test vehicle

Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Neon Yellow) subaru-ascent-2019 The included billet turbo adapterOVERVIEW The PERRIN Air Oil Separator traps oil from the crankcase vents before it enters the intake, reduces carbon build up, increases intercooler efficiency, which reduces the chance of performance robbing detonation. NO TUNING REQUIRED Increase horsepower and torque without ECU recalibration or tune! This part is designed and tested to work safely on your vehicle without any tuning required! However, more power can be gained with proper ECU