Well I was doing a little research on this subject again this week and found this little product from Boomba Racing.
http://www.boombaracing.com/mustang-ecoboost-blow-off-valve-adapter/
I ordered one for my car and installed it yesterday. It sounds just like the one in the video on Boomba's...
Has anyone seen any aftermarket blow off valves for the 2015 EB Mustang? I seen where Turbosmart made one for the Focus ST but haven't seen anything for the Mustang yet.
Just to let everyone know, I sent an email to Procharger and got a reply. They will be making a supercharger system for the V6. They say it should be available in 2015.