they can be modded to fit with a lot of work... the question is do you want to cut the shit out of a set of bargain basement headers that weren't that great to start with, then spend 2800 bucks in labor to get them re-fabbed to fit the 5.4. It's not worth it IMO. The 4.6 longtube headers hit both frame rails and the steering shaft and the tranny and the bell housing and they rub BAD against the floorboard. There's just nowhere they fit well so it ends up a total re-fab.
At this point unless you're dying for the 20hp extra, I'd say just stick with FRPP shorties or JBA shorties or stock logs. The power difference can be made up with 25hp shot of nitrous, so add a 50 shot and call it a day with cheaper headers.
I got boned on my heads which basically made my headers pointless. If anyone wanted to give me the 4000 bucks for them I'd consider selling my pipes. eheheheheheheh
And yeah... I do regret wasting all that money. The only upside is maybe just maybe having all that cash invested will get the car in one of the mustang mags as a feature car someday.
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