While the turbo spins over 100k rpms there is no gauge for it and he hears it while not on the highway, generally the turbo is going at highway speeds so.... So what speed does the motor actually rev when you hear this? 1,000rpms?

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k