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There are alot out there and alot of opinions on here, search FTE for "headers" or "exhaust manifold replacement", it has been discussed in depth and some of the problems that can occur.
Like some company's say you need a body lift, all you need to do it trim your inner fenderwell a bit.
I use Hedman on my 79 F250 351 4 spd, with no problems and no body lift just a inner fenderwell trim.
L&L $$$, Hooker, Hedman, Summit, Dynomax, Flowtech, Gibson ... to name a few for you.
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.