Well if you boost 15-20 psi on ur stock turbo you aren't going to have a turbo more than a week, if that. The stock fuel system can handle some power but if you upgrade the fuel pump, you might as well upgrade the injectors to 550cc. And it would be a very good idea to look into a fuel pressure regulator. Aeromotive regulators are a popular choice. Also to get more air in, you're going to need to buy a Lexus LS400 AFM. Not sure of the year but it's an older one. It's just a bigger housing that allows the stock AFM sensor to bolt to it.
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