Strong exhaust odour when stopped

[Dene2006]

I just came back from Arizona today with my first diesel. It's a 2004 f250 with 92,000 on it and it is mint. The re-seller said he just replaced the turbo. Being new to diesel trucks, I'm wondering if there is something wrong with the exhaust system or the newely installed turbo. Could there be a leak that fills the cab with a strong odour or is this normal? Could it be coming from the turbo area, (can't feel or see anything when the motor is running). What would the usual reason be for a strong smell that goes away when you start moving over 20mph please?
Thanks

[Snake]

Yes. Most likely you have an exhaust leak either where the down pipe (goes back to exhaust pipe on the passenger side) or the up pipe (back of the turbo on the driver side) attaches to the turbo.

[Dene2006]

Thanks Snake, I'll mention that to the mechanic.