If you have means of turning the boost up past 18psi, (alky or racegas)
The turbo alone will be 50-60 horses over the stock turbo
The alky kit alone will be an additional 50-75 horses over the stock turbo at low boost.
So, get a alky kit, 009 injectors with Tweak chip setup for the 009s and alky with a ta49 turbo and your looking at a honest 100 horse gain.
My dads WE4 has the ta49, bluetop 36# injectors and a old smc alky kit. His car is mostly stock, still has the stock ic and torque convertor, the boost comes up real quick since it has a ball and spring style boost controller.
PS, i would get a oversized puck for the elbow to insure that the wastegate hole is 100% sealed to get the boost to come on like it should
Let me know if you have any more questions
BW