Quote:
Originally Posted by m4a1mustang
Yeah the OEM headers are pretty killer. We don't see quite the gains with exhaust that you guys do since the factory exhaust was engineered so well.
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yeah, Ford went all out engineering these things for power, its almost like they added aftermarket headers along with a sweet H-pipe. Only gripe I have about the factory exhaust is the crimps they put in it to get it to clear the cross member and rear axle. And yeah, a few guys are dyno'ing around 390whp and 360wtq, and if you factor in 15% drivetrain loss, its making around 440bhp and 405 ft/lbs, so its not entirely out of the question. Another funny thing is that they seem to pick up another 10whp/ft.lbs after the engine has reached 1500 miles or so.