2007 d4500 have dpf?

[Bubbiebus]

I'm looking at a 2007 d4500 with a Detroit.  The person selling can't confirm if the vehicle has a dpf.  I know the 08's have a restyled rear cap to accommodate the emission changes.  The owner knows that the bus doesn't require def fluid.  I'm just trying to make sure this 07 doesn't have some sort of mid model dpf that is diesel fed.  Does anyone have any info that may be able to help me figure this out before I drive 3 hours to look at the bus?  Thanks

[luvrbus]

The 2007 were EGR only no DPF except CA engines ,the DEF came in 2010   

[Bubbiebus]

Thank you