Not sure on this truck, but my previous turbocharged vehicle got quite a bit louder when I put a new intake filter on it. Basically, getting rid of the big plastic box and just going with a cone filter.
If you do a intake on the EB, you do hear the turbos a little bit more but not significantly like when downpipes added. I did a basic AirAid drop in CAI on my 12 EB and heard a little bit more turbo whistle.
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I have the AFE stage 2 intake and all I hear is the air sucking sound and the bov's release. No increase in turbo noise. I have the 4" solo performance exhaust as well with the Mach 46 muffler and at idle can hear the turbos whining if you listen closely. I plan on doing the solo performance carted downpipe in 2015.
__________________ 2011, F150 FX4 Screw, 6.5' bed, FX4 Luxury Package, White Exterior, Black Leather Interior, 18" wheels, & Ecoboost. SOLO 4" Mach-46 Exhaust, Pioneer 3-Way speakers in all doors, PAC aoem frd-24 sterio adapter, Sound Ordinance B-8PT subwoofer. 35% tint on front windows, 5% over factory on rear window, and a 5% Strip on windshield. Access Vanish tonneau cover. 2" Hell Bent Leveling kit, LT275/70R18 BFG Rugged Terrains.
I hear my turbos whistle and it's loud... I do not have the resonator or muffler and the pipe is dumped basically under passenger seat. I also did the VTA mod... I still want to make mine louder and do true duals with offroad down pipes but I'm not sure if that will be ok on the turbos