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I just got done installing headers on my 84 F150 4wd with the 300 six. It was a lot of work fabricating and getting the exhaust to fit properly underneath the truck, but it is completely worth it in the end. I have a Flowmaster muffler on my truck currently, it sounded good with the EFI manifolds but sounds kinda ricey with headers. I plan on going to either a Dynomax or Magnaflow to take the raspy sound out of it. If you're lookin for power, you'll find it with headers. I got mine from Jegs for $160!
You have to grind/cut on a bracket before they'll fit, IMO unless you are building the entire motor up, it's not worth the time and money if you already have EFI manifolds.
Pkupman82, I know you have to fab in the O2 sensor, but what about the smog pump deal? Im pretty sure its a smog pump, it plugs into the efi manifolds right before the 3 goes into 1. Im pretty set on getting hooker super comps.