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yeah they are extremely expensive. longtubes for a 2v mustang will not work without some custom fabrication (they aren't long enough because of the taller deck height on the 5.4).
It's not that they aren't long enough... the taller deck height of the engine makes the headers hit the firewall/floor.
i have mack long tubes they are hitting on the steering shaft and frame rails so i went with ford racing shorties hated to loose the upper end horse power b ut had no choice dont really have 1200 bucks this engine build has been exspensive!