ok heres what I did when I was 18 to make my turbo sound louder... either drive on a gravel road without an air filter and tear up the turbo or bend the fins on the turbo on the edges so it whistles

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1969 230 inline 6 dual carb 60,000 Miles 2nd Owner doesn't run right
1982 300 SD 455K - my reliable commuter car
1990 190E needs new crank shaft ran it out of oil
1996 C220 bad wiring harness