...how quickly some are forgotten. :grin:
I'm not 100% certain, but the Saleen Series VI charger I have in my '08 ST may be CA legal. I'd have to check out what the differences are between New York State where I am, and California to be sure. NY has been getting tougher, though I passed emissions in NY this past May after some adjustments to the SCT x3 tune, as a couple of systems weren't active by default. All ended well.
My website has a bunch of info and photos about the Saleen install that Brenspeed did for me. While Saleen was their first choice and mine, they did also mention Edelbrock. BBR (Blow-By-Racing) in Florida just recently finished I believe a Roush charger (Eaton M90?) in an '08 Adrenalin 2WD.
You have a few options. It's very do-able. There were a few other modifications with the Saleen setup (hoses, alternator position, big electric fan in place of stock, some wiring harness mods, larger fuel injectors, relocating the coolant recovery tank... are some that come to mind off hand). No relocation of the battery on my setup.
The stock '07 and '08 Sport Trac 4.6L 3V should have the same setup under the hood.
Best of luck. Give a shout if I can help with info from my experiences.
Joe M