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turbo rebuild

Fuel System

Model: 911 turbo, Year:1977, Mileage:46000, Type of use:Both Street & Track
I have a 77 930 with origional turbocharger. Starting to see some smoke while on the turbo. Wanted to rebuild or replace seals while I have turbo on the bench for exhaust replacment. Have been told to upgrade to K27 but I do not intend to add intercooler. Current origional still makes plenty of boost. Should I upgrade?

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