Inconel exhaust valves from Supertech for all 2.5L TFSI Audi engines, like in the RS3 and TT RS.
The VAG standard valves have the big disadvantage that they can break on engines with significant power increase or long mileage. The stock valves are hollow inside and sodium cooled. With the very thin valve stem there is not much material left to protect the valve!
Inconel is a very strong metal alloy and is used in Formula 1 engines.
