There are a few ways to do this and will depend on time, budget, emmisions, and how much effort you want to put into this.
1)Are you wanting to stay OBD-II? If so, the simplest way is to run a small turbo, find a low setting wastegate (under or around 5PSI) and allow for your factory computer to adapt to the added demand for fuel. It's doable, but not optimal.
2)Stay OBD-II, run a SCT tuner, find some aftermarket rods/forged pistons for the 2.5 and then you can set it up really well. This will likely require a larger MAF (90mm) and larger matched injectors pending on your goals.
3)Swap to an older 2.3T, run older electronics and get involved in an *** load of rewiring and complications. (not the best choice for you, or what I'd recomend)
There are multiple ways under option 3 to go about it, none of them easier than the other so I won't go into any of them since staying OBD-II will be your best choice since you are already setup for it.
1994 2.3 XLT Turbo
Ranger Roller cam 2*R, T3, Gillis @ 20psi, 3in downpipe dynomax ultraflow, no cat, Large NPR, Turbo XS RFL BOV, LA2, Bob's big log header, Gutted/Rotated upper, Knifed lower, 65mm TB
'96 Expo 8.8, LS, Disk Brakes
245/45/17, Chrome SALEEN's
Getting over hauled!