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Look up sts turbos they make a universal kit for $1700
Did you miss the part about him having to be California smog legal?
Andrew...at this point....taking into account the new light you've shed on the subject, that is having to pass Californistan’s smog laws, you're pretty much stuck with bolt on parts. You won't make any big power gains, but you'll keep the Smog ****’s happy.
I hate to say it, but if big power and torque gains are what you're after and you're not attached to it, you're probably better off trading in your current ride for one that's already 5.4L powered. The options from that point are much better for you.
I just put a Edge in my 4.6 and wow it really woke the truck up, if your looking for some easy cheap upgrade you might want to look into the Edge. It made it feel like i just dropped a 5.4 in it. I just did it tonight and drove it a couple miles and i have to say its the best 5 min. upgrade ive ever done. I am extremely pleased or i should say exstatic! about the results. Just something to look into!