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Those considering fitting a bling Billet BOV or diverter valve may be interested in the opinion of RS Tuning:
This valve gives not any advantage to the engine!
The original part is working as well as the aluminium part!
There is no heating problem at the instalation point!
A lot of people saying ****!
Just an opinion, but check out their relative credentials
One thing I have never understood is why we experience no failures with the stock BOV, yet the Audi guys seem to experience many in what I believe is the same part. More boost? Higher operating temps? Not the same part?
and a further related question - is there any significant difference between the Evo and Bailey valves or is it a matter of which your favorite vendor carries?
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