I have a pair of these from my Stage 3 S4. I took them off because I wanted to run 710Ns and free up a little money (need new cam seals and secondary water pump).
The valves held 23+PSI all day long, and threw no CELs. I personally think the whole "running rich between shifts" thing is BS. My car runs the EXACT same with these as opposed to the 710Ns.
They are in perfect condition. Looking for $125/valve
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