It only does that when you let off the gas completely, other than that it works fine. Too much hassle to install a Bov when the ecu has electronic control, and have to deal with the codes, if you don't have tuning software to reprogram it.Oh... Hm... Different strokes i suppose.
You definately need to get a vacuum operated BOV if you're gonna run that, tho.
Kompact Shortie Dual Port - Ford Mustang 2015+ EcoboostI'm using a Turbosmart BOV on my 2.7 Eco Edge model #TS-0203-1081 (won't let me post links yet)
I would imagine this would work for you guys too. It will also give you an area to tap in an impulse line to get a reference for a Vac/Boost gauge.