Last year I bought a Passport Escort and have one 4.55 and many 4.7 - 4.9, but also had some 5.5 with too much wheel spin or ESP engaged.
I internet shopped this device that attaches to the windshield and got the upgraed $200 model of less than $100. It really taught me how to cut the tenths off the launch, here are a few things that lead to the 4.55 0 - 60 and 12.9 quarter:
1. lower rear tire air pressure (25ish?)
2. ESP all off mode
3. leave in first gear and burn the tires for 4-5 seconds
4. choose a road that has a good traction surface, preferable a rougher concrete as apposed to blacktop
5. Get into WOT quickly buy not just pedal to the medal, with all of the above in place, maybe 1/4 to 1/2 second to the floor
6. Probably most importantly was lower ambient air tempratures! Seemed like 2 -3 tenths once the outside temprature was about 40-50 degrees.
You guys like me with 06 or 05, spend a couple of bucks and you will have a blast. Many articles on the different models. The passport has been proven to be within 1000's of track clock.
Richard
Here are a few threads that I could find. There could be others as I’m on my way out the door from work….but there are a couple that may provide some interesting information at least. Good luck! 
Linear Mode
