I stand my original suggestion to the OP: If it has been tuned don't buy it
As mlh said, if it has been tuned, KNOW THE TRUCK
My contention on this is that performance modifications are done for the sole purpose of pushing the engine beyond the engineered perameters. More fuel and more air mean greater pressures and temperatures in the engine and greater torque force through the drive train.
You have no way of knowing what a previous owner 'used' his added power for.
If it is a short term ownership you want, then it may not be an issue. My belief through personal research is that a 'souped' up truck will never reach the longevity of a well maintained, stock truck
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