You may have had to boost at 20 psi, but more than likely it was more inefficient to run it that high. I think that the max efficiency of the TD04 is around 12-15 psi. Find some flow maps for that turbo, and figure out what CFM you need for your car. Turbos need to be matched to the car. You can't just slap any turbo from any car on any engine and expect it to work well. =)
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