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Boost pressure has no direct relation to how far the throttle is depressed. The amount of boost produced has to do with how much exhaust is flowing through the turbo, and therefore how high your RPMs are. True, you'll never reach the top end of your rev range without WOT, but you also won't produce peak boost (if any) at 2000 RPM at WOT.
Most "bolt-on" turbo kits will work just fine with the stock motor- obviously, or else they wouldn't be bolt on. They don't produce enough boost to endanger the engine (up to 8 psi). Past that, building the engine for turbo would be advisable.
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