i put an airaid on mine. it works great...just a pain in the ass to get the stock box out and this in. took about an hour to do. the intake adds a little more power and better sound coming from engine compartment. mileage didn't really go up a bunch. maybe 1 mpg. get an intake elbow while you're at it and replace that at the same time. smoother air flow.
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2006 6.0L Lariat CC SB FX4
Leveling kit, 17" Moto Metal wheels, 305/70R17 Nitto Terra Grappler E,
Hypertech Max Energy, CFM+ Intake manifold, Airraid intake system, AIRFURY induction maximizer, 4" MBRP exhaust, cat delete
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