I have to disagree guys. I put the shorty headers on my 3V 5.4 with the complete magna flow system and notice a nice take off and aggressive sound. HEADERS alone I feel wont give you that much gains just minimal. I feel if your just going to do the headers you need to help the headers out with the complete exhaust system.
Which header did you use? So far, I found only one for the 3valve,
a stainless Gibson. It was over $700, I think.
Do you use the factory Y pipe in front of the MagnaFlow system?
If they make a better flowing Y pipe that bolts up like the shorties,
that's even better.
Like you said, all those things working in concert will give you
an actual gain.
Stephen