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2.5L 20v - DAZA DNWA
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2.5L 20v - DAZA DNWA
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Set of 10 exhaust valves, SUPERTECH / FERREA, for AUDI 2.5 TFSI CEPA, CEPB, CZGB, DAZA, DNWA engine:
References: VWEVI-1004S, VWEVI-1006S, VWEVI-1002S-HS, VWEVI-1002T, VWEVI-1002S, F2417P, F2418P
The SUPERTECH and FERREA reinforced exhaust valve kits for 2.5 TFSI engines are made up of 10 valves.
Below (click on the images) you will find the accessories for AUDI CEPA, CEPB, CZGB, DAZA, DNWA engines:
Technical specifications 
SUPERTECH valves are machined from a forging on CNC equipment for optimal precision. They then undergo a heat treatment (which varies according to the valve's application) and are ground again (super-finishing process). SUPERTECH valves are checked by various means such as ultrasound, X-ray and laser measurement...
For more than three decades, SUPERTECH has worked to find the most suitable materials for each valve and each application in order to increase reliability. There are therefore different valve materials such as stainless steel, Inconel, titanium and sodium (the latter is present in the valve stem and allows better heat dissipation).
Technical specifications 
The manufacturing processes of FERREA Racing Components valves are similar to those of SUPERTECH: slow two-stage forging, heat treatment with 48 hours of stress relieving, and CNC machining. These valves are designed to achieve better reliability in all circumstances, but also to improve flow with a thinner stem at the valve head (Superflow Valve). FERREA develops different ranges/materials of valves to respond as accurately as possible to the constraints of each engine and each application (naturally aspirated, turbo, nitrous, etc.).
