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I just bought for my 98 GST spyder:

1) GReddy Type-RS Blowoff Valve
2) GReddy Piping Kit
3) Turbo XS High Performance Boost Controller
4) Boost, Oil Pressure, Air Fuel Gauges
4) eBay intake (installed already)

Other than that the engine is stock. What level do you think I can run the turbo at safely?

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15 psi

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15 on stock fuel and turbo.... with a fuel upgrades and a 16G turbo upgrade you could run like 20-22PSI but the stock turbo is not good past 15 (even then it is still a waiste)

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how much does it run stock?

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the turbo runs anywhere from 7-9 psi depending on if you have removed the bcs.

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agreed since no fuel system upgrades have been done.

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actually i think they run around 10-12psi stock. But the next thing i would do is exhaust. 3" turbo back

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I always though 9-12 was stock on them but I have never owned one so I cant say for sure

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i've heard that it varies from car to car. some cars come stock running 7-9psi, some come running 10-12psi. theres no real way of telling until you get an aftermarket boost gauge and check it.

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9 psi(+/- 2psi) the stock fuel system can take up to 17 psi but I wouldnt recomend that because any more and boom, the pistons turn into slush. Its a safe shot to run at 15, but you can bump it up to 16 if your racing someone and you need that extra little kick but 15 is deff a safe way to go.