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No because of the MAF sensor, it won't see the air which is entering via the valve

Paul
 
The twin piston ones are fine, closed at idle. TBH though i'm not up on dump valves for tdi's and can honestly say i have never fitted one!
 
Demon Tweeks do a "Dump Valve Soundking Kit"

......I'll get my coat
 
26not-this-again.jpg
 
I know all you guys say its to chavy and that but i am actually getting a forge one by the time i get it i will have spent my money on all the performance mods and i hate it when i drive with my bro steve who has a carbonio and his car goes pssshhhh everytime he changes gear and i just think it sounds so nice that i have decided to get one!