A) the cage looks cool, but is major overkill you lost half a second in the 1/4 mile just welding it in...
B)you need an open cold air intake to take air into the turbo, a boost controller, a computer chip, (ie rocketchip)and a boost guage....
that will allow you to turn the boost up some ,
you need a hard pipe kit and a front mount intercooler, these with your exhaust would be a good start and would let you turn it up from the stock 8 psi to about 14-16psi safely...
from there you can put a BOV, a downpipe, high flow cat, bigger turbo, injectors, ect.ect.ect.
the problem really remains that all these things are going to cost money...how much depends on who you know, and what quality componants you buy....