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engine problem with 1 bar boost spring

Engine

Model: 930 Turbo, Year:1987, Mileage:67K, Type of use:Street use only
I have an 87 930 Turbo with 964 cams, Evosport cold air intake, B & B exhaust with stock headers, Garrett 35R Turbo, .8 Bar boost spring.When I installed the Garrett I was told to take out my 1 Bar spring and re-install my .8 bar spring due to the fact that with warmer weather coming to So Ca. I could blow my engine. Now that I have put in .8 spring my performance is way down. Do you think that if I put 1 bar spring back in that I could have an issue with my engine being damaged? Please asap. Thank you very much. Tim Koger tinytim471@cox.net/949-887-6291

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