Vibrant TurboFlex Coupling w/ Interlock Liner, 2.25" I.D. x 6" Long - 60706 3/8" 4200103 is a 4-pad spring-centered

4200103 is a 4-pad spring-centered race disc made with high quality

ZM10-HDG6 kit features ACT's most popular Heavy Duty pressure plate

increasing the inlets to 2" and outlet to 3" for a 51% boost in flow straight out of the turbos

The OEM Coolant Overflow Tank for the 2008-2014 WRX/STI does its job well enough but the cheap plastic material is ugly and will potentially crack over time

Vibrant TurboFlex Coupling w/ Interlock Liner, 2.25" I.D. x 6" Long - 60706 3/8" 4200103 is a 4-pad spring-centeredVibrant Performance TurboFlex Couplings feature an internal Stainless Steel Interlock Liner to facilitate smooth flow and also protects the bellows from direct exposure to high temperature exhaust gases. Recommended for all high flowing, high temperature applications (e. g. forced induction).