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Yes you lose a lot of power at high elevations without a turbocharger on any diesel. At 4000+ feet elevation when pulling hard a lot of what would be horsepower is going out the tailpipe in the form of black smoke. I tow a lot so I turboed mine at 30,000 in about '92 and it made all the difference in the world. No smoke at even at 9,000+feet, same pulling power as at sea level. No matter what elevation the turbo system greatly increases pulling power and torque. If it's set up right I agree with the ATS Turbo company former owner, you won't shorten engine life or reliability. My complete kit including 3" exhaust cost $2400-$2500 back then. I've got 241,000 now, never done any internal engine work and use 1 qt of oil between 5000 mile changes like when I bought the truck new in 1991.
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