Doing some reading from Richard Holdener, and I came across this, it is worded as follows: "The 3v motor was equipped with JBA long tube headers feeding 2.5inch open pipes. The F.A.S.T. system was used to dail in the A/F ratio at 13.0:1, and the timing curves at 30 degrees total advance. Running in this configuration, the stock 4.6l 3valve produced 356hp at 5800rpm and 392ft-lbs at 4300rmp."

Is this possible? is it safe for the motor? Thanks all.

can you post a link to the article....thanks

Are they talking about RWHP or crank HP?

I am guessing it's crank HP, in which case there is nothing at all weird about this at all. The FAST is just a tuner, no different than the Predator or SCT-2.

FAST is releasing an intake manifold soon (longer runners).
No HP #s or $$ yet. (40HP was mentioned.)
But it said to install the dropped bullet eng mount (like Saleen uses) to prevent hood contact.
http://www.fordmuscle.com/blog/new-manifold-for-05-07-mustangs/112150