Originally Posted by FTE Ken
Not to be a smartass, but if that's the best you could do with an intake, full exhaust and a custom dyno tune then you also need to replace the person tuning the car. Tuning the 5.4 3v V8 is more than just strapping it on a dyno, advancing the timing and getting the A/F right.
Bob Kennedy has been in the business for well over 40 years. He's also a hardcore racer and very well known in the industry. I think I had someone who knows what they're doing take care of the tune properly. The tune wasn't THAT far off, but there were a few small things that needed attention, like fan cooling settings, timing curve, and the idle hunt and surging was a real PIA. The AF was off a bit as well. The stock computer really didn't like the cam swap.
http://http://www.kennedysdynotune.com/