First of all congrats on the little bundle of joy. Secondly if you already have a turbo in there, then your done

.
JK, but really what more power do you want? Like Gearbox suggested make sure everything is properly tuned. I noticed you didn't say anything about an engine management system in your car so again its really important you get the ride checked out and properly tuned if its not right now. I'd also check out the regular stuff in your car like your fluid levels, spark plugs, ect. Having that turbo won't mean crap if the rest of the car is not properly maintained.
Having a turbo set at 8 psi with stock internals is basically pushing the limit there but its not over stepping that line. Our cars and trannies can handle up to 200 hp/tq before requiring upgraded internals. If you are not looking for a beast on the street then I'd say just leave it alone.