3MI Racing AOS Oil Return Hose Kit Install "Short Kit" Subaru WRX 02-14 / STI 04-21 | 3MI00125017 FIT_2009-2014 Mono-Tube Shock Design: Improved responsiveness

Mono-Tube Shock Design: Improved responsiveness and durability

and is also three times more heat resistant

1999-2004 Subaru Legacy

the connection between the duct and airbox has been enlarged by over 149%

MSD Atomic and Vi-Pec ECUs

3MI Racing AOS Oil Return Hose Kit Install "Short Kit" Subaru WRX 02-14 / STI 04-21 | 3MI00125017 FIT_2009-2014 Mono-Tube Shock Design: Improved responsivenessFitment Information: 2002 2014 Subaru WRX 2004 2021 Subaru STI Please note: This kit is a direct fit for your KillerB or Verus AOS system. Other AOS systems may require additional components for the installation. Features: Many drain hose installations have the drain hose close to horizontal or with very little vertical angle. Under acceleration this prevents the oil from freely draining back to your sump. It is also well documented that EJ engines,