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If you are using a stock actuator 5.5psi is about correct. The installation of your new headpipe will be badly effected if you raise the base boost too high. The headpipe is designed so that when it opens it does not negitivly effect the turbine discharge. For this reason the waste gate has to flow more air than ever before. If you adjust it to 10psi it can not open far enough to keep boost where you have it set. If you want a 10psi base boost get a 10psi actuator.
Watch for boost creep at high rpm.
Brad
posted by 24.121.5...
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