This an aluminum weld-on piece to attach right to your front cover to vent your crankcase and catchcan. Compatible with all 4G63 front covers. Vehicle Fitment: Mitsubishi 4G63 1996-2006 Evolution IV V VI VII VIII IX 1990-1999 Eclipse GST/GSX 1990-1998 Talon TSi 1990-1994 Laser RS 1991-1993 Galant VR4 Full Description: If you need the biggest and baddest way to vent your crankcase, the STM -12AN Balance Shaft Breather Fitting is an aluminum weld-on piece to attach right to your front cover, giving you a perfect place for your oil catch can fittings. Please make sure that your particular set-up will accommodate this option as it will not be for everyone. Includes: (1) Weld-on -12AN Fitting