To some, this question may sound dumb, but this is my first diesel purchase that contains multiple emission devices & I just don't know all the parts yet. My question is; does our truck have a "catalytic converter"? I know it has a DPF (Diesel Particulate Filter); could the DPF also be called a "catalytic converter"? Service stated that's the 1st thing they have ordered & its on back order with no date of availability. Is my chain getting yanked here? Thanks for any info you folks can provide.