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Dang man. You'd die in a 6.0L. My straight pipe 6.4L is hardy audible in the cab. But I plan on eventually muffling it.
I would check to make sure you installed the muffler the correct direction. Most modern bolt on kits have two different ways to install the muffler, one is louder and one is quieter.
Other than thatc you have two options: throw on another free flowing 4" muffler, or add a 30" resonator from FTE. The resonator will probably get rid of the hair dryer noise, and allow the turbo to still sing a little bit. A second muffler would probably get it back to stock sound level, but just sound a little better.
2013 F-150 CCSB Oxford White FX4 EcoBoost
Loaded with every option...
2008 F-250 CCSB Dark Copper King Ranch 6.4L FX4
4" MBRP Exhaust w/ Muffler (DPF/DOC Delete), Modded Stock Intake, H&S XRT Pro