Well, don't go by me.
There's all kinds of decent F/I, and I'm not saying the X is the best. It's just the one that I went with. I don't know enough about the other systems to comment on them.
PH turbo seems to be the one that puts out the most hp though.
I'm sure there are ways to set up the other systems for lots of low end torque. Talk to the guys on the Collective. Probably more hard core V6 tech info there than anywhere else.
For me, I went with the X because of the torque monster factor, the super easy install, comes with 2 Bama tunes that are ready to go right out of the box, complete kit with super thorough and detailed instructions, cool factor of a roots blower, awesome sound of the blower screaming when I jump on the gas.
Note that I didn't put a priority on racing. My car is a daily driver, and I just want to have a car that's fun to drive every day. Some time I might take the car to the track, and I'm sure it'll be fun and it'll do fine. But I'm not out there hunting ET's like the hardcore racers.
People are saying that the X-treme should easily do 12's though.
Here's the installation docs for the X, if you haven't seen them already.
http://www.explorerexpress.com/image...Mustang_HP.pdf
Btw, there's a water/meth injection option which is pretty cheap if you don't go intercooler.
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2007 Satin Silver V6 / Explorer Express X-Charger #67 - HiPo 2.8
MSD, JBA, FRPP GTA duals, Zabteck, J&M, Steeda, Tokico d-spec, H&R SS, Eibach, Shaftmasters, 8.8, t-lok, 3.73, OE Wheels Cobra R 18x9/10, Nitto 555 255/285