aFe 48-43001 Twisted Steel HeadersaFe 48 43001 Twisted Steel Headers Add more power to your 2011 2014 F150 Coyote with the 5. 0L by installing aFe Powers Twisted Steel headers. These headers feature 1 5 8" mandrel bent tuned length primary tubes that will outflow the stock cast manifolds by 46%. These headers are built using 409 stainless steel and feature thick 3 8" flanges for a leak free seal. We designed the headers to incorporate a merge collector (header collector). A merge