Sorry dude, they did not make 3V motors in 2003. They made 4V motors in 2003-2004, and 99-01, etc. 3V's are found on the 05-2010 Mustangs.
Also, there are no 2005 4V Heads.
You do know, a Turbo Termi, running 10 PSI, is going to make probably around 550+ RWHP? That is on an 8 year old car. I take it you've never owned a Terminator. I've owned both a 3V GT, a 4V 03 Cobra, and will be going into my 3rd mustang shortly. While the 2011's are Great cars, why compare to an 8 year old car? Why not compare to the new "Termnator" and compare your GT to the 2011 GT500. No comparison. The GT500, or 2011 "Cobra" is way better than the GT. Before you start guessing numbers, that a 7 PSI will gain at least 50 % more RWHP, prove that it will with physical evidence, not a guess or an intelligent guess for that matter. Terminators proved themselves well before your GT came out. Yet, they still prove themselves against the 8 year new GT over and over. Says something about the Terminator huh.
Stop with the ricer talk. So far, the 400+ HP GT has yet to run faster than the fastest Terminator has run, even with Evan smith driving. The 2011 weighs less, has a solid rear, etc.
Enjoy your 2011. Don't be surprised when an old car with little to no modification is pulling you.
:bash:oke: