7-8 psi is just wrong. psi is irrelevant. torque figures are what you need to look at. most safely run 220-250 wtq on the stock engine. on smaller turbos this will take about 12psi.
like tom said turboing is only half the battle. what ever you choose make sure you get good tuning
Turbo Turtle Garage
Zetec and Duratec Turbo kits, engine building
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