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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Alright dude, let me make it simple, if you go to a long header you are going to need to switch to a heated 02 sensor (SN95's have them i dont think foxs do). They dissipate too much heat and the o2 sensor wont work right if it cant get heated up. You can get ceramic coated headers to avoid this. You'll also have to get a longer wiring harness (they make 'em) to reach where the o2's have to screw in. Long tubes also aren't legal for use on the street. But thats up to you, i would run 'em if i had 'em cuz i dont care. Long tubes will give you tons of torque and horsepower, short tubes will give you almost as much horsepower as a long tube but no where near the torque. I read an article where they bolted on long tubes on a new 3v GT and then some short tubes. The long tubes gave it 55lb/ft of torque and like 20 more horsepower, while the short tubes gave it like 17 more horsepower and like 15 more torque. But peak numbers dont matter, its about that powerband, the long tubes will give you a WAY fatter torque curve. I bet on a347 you'll be quite pleased with 'em. I SAY RUN "EM!