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Pictures would help so we know what kind of install your mechanic did. No two are the same...
Cutting boost at 10 psi is normal for a non-turbo car. If you went much higher, you would be sorry.
This may be a fuel starvation problem. The manual calls for a certain amount of fuel to flow in 30 seconds I think it is 51 ounces (1500cc). If you get that much, flow is good.
Then I would look for a lean condition, that could also be contributing to your running hot.
$3,000 for a turbo is about right, depending on how many parts were included. Do you have an intercooler?
Mark
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1991 964 Polar Silver Metallic Turbo Coupe
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