I've read the 1.6 ecoboost uses a recirculating valve which is a blow-off valve integrated in the compressor housing.
You can always add a dump valve to the car, is this what you are looking for?
[video=youtube;5MVcobZbxm4]http://www.youtube.com/watch?v=5MVcobZbxm4[/video]
[video=youtube;81N0LrdOBk0]http://www.youtube.com/watch?v=81N0LrdOBk0[/video]