In the end, a blow off valve is the same thing the car already has. I am sure when running more boost, an HKS or other BOV is going to have a more appropriate spring rate and what not, but other than that its not really different.
You think AA really does some sort of rocket science with it? They replaced that section of piping and stamped their name and a $750 price tag.
EDIT: I also used the materials because I do want this to be 100% reversible to stock, and easily. 3 minutes and my car is back the way it was before.
AA M3 is gone...the new...