Viton O-ring for better sealing than RTV/Gasket alone( RTV is still recommended to add)
No need for an oil pan brace, extra thick 0.650" flange increases rigidity and sealing substantially
Trap door baffle system designed to prevent oil starvation under track conditions
Increased oil capacity( FC3S 1 additional quart); Does not sit below OEM subframe for both models
External fins for increased oil heat transfer
1/8 NPT oil temp sensor bung for both models
FC3S models feature boss location to easily add oil drain port for non turbo engines, or extra vent location( 10AN ORB, pre machined, but requires drilling for use)
Models do not include OEM low level sensors, as they take up too much space for the trap door baffle system.
