Ferrea Competition Plus Exhaust Valve Kit 28mm STD - BMW S55

Ferrea Competition Plus Exhaust Valve Kit 28mm STD - BMW S55Actual part may differ from image above. S55 engines contain 24 valves 12 intake and 12 exhaust this Set contains 12 STD exhaust valves. Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8 Z18, which provides high tensile strength. An exclusive two step slow forging process ensures proper grain flow and virtually

Actual part may differ from image above.


S55 engines contain 24 valves - 12 intake and 12 exhaust this Set contains 12 STD exhaust valves.


Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to the material structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip. 



- Valve Tip Length 5.2mm
- Stem Diameter 5.96mm
- Valve Length 112.83mm
- Valve Head Size Standard
- Valve Head Diameter 28mm
- Valve Type Exhaust
- Valve Stem Diameter 5.96mm
- Valve Material Stainless Steel, Super Alloy



Replaces OEM Part #  11-34-7-847-033 / 11 34 7 847 033 / 11347847033