have you checked out the squires turbo system? if i remember correctly, you had a tacoma in your sig, well they make a kit for it. i don't know the difference between the x-runner and regular tacoma, but they got some pretty decent numbers out of a regular tacoma:

4 lbs of boost
60% hp increase
59% tq increase
2.75 seconds shaved off of 1/4 time

the turbo they use is a garret T04B s-trim .58 a/r. that seems damn good to me. here's a link to the tacoma section of their site: http://www.ststurbo.com/toyota_tacoma

here's another good link that explains turbo lingo: http://www.turbobygarrett.com/turbob...tech102.html#b