Hello, 1_slo_92:
You have a couple options to go with.
1.You can get a Wastegate Shim Kit...provided by MDCmotorsports:icon_surp, which you can order through me right now.
The kit comes with longer studs & a variety of sizes of shims (in mm's) to meet your needs. If you are unfamiliar, you just pop off 2 bolts on your wastegate actuator, stick shims under, put bolts back in! This would be a good option for your stock turbo if you want to squeeze just a few more psi out of it. When I ran a stock turbo, I ran 13.5psi for a couple months before I went with a Manual Boost Controller (which is your other option).
Provided you have some deep pockets, you can also get an Electronic Boost Controller. I actually just installed my HKS EVC about a month ago and I'm LOVING it.
.
Anyways, if you are intested in the Wastegate Shim Kit, it is $15 + S&H ($8.00 to the central 48 states) and you can find it at
www.MDCmotorsports.com or just PM me and I can get you more details.
Thanks and good luck.
Jeff @ MDC
BTW: If you get 550cc Injectors, DO NOT RUN IT without getting a Lex AFM or MAFT(PRO). Same goes the other way...And a Walbro 255lph would be nice to have if you are upgrading your fuel system, as well.