2005/06 Engine Question

I have a friend that has either a 2005 or 06 2500HD with a diesel engine and I asked her if she had a turbo diesel engine and she said no. Now when I look up trucks like hers all I find are 6.6L turbo diesel engines. Did they make non turbo engines? If it helps she has the allison trans..
Sonny01

I have a friend that has either a 2005 or 06 2500HD with a diesel engine and I asked her if she had a turbo diesel engine and she said no. Now when I look up trucks like hers all I find are 6.6L turbo diesel engines. Did they make non turbo engines? If it helps she has the allison trans..
Sonny01
The Duramax engine is a 6.6L and is turbocharged. This is the only diesel engine avalable in GM pickup trucks.

Thanks GMMerlin!