Don't mistake a catalyst for a DPF. DPF would mean you have no soot coming out from the back at all! Mine even has the "DPF preperation" option code in the boot sticker and I know it's not there as I've had a custom exhaust fitted and replaced the second cat with a straight pipe.
Well I've been stitched up then, this is what I have under my bonnet attached to the exhaust side of my turbo ( this is the one I bought to gut for remap).
This was sold to me as a aftermarket dpf ref audi part number 8e0 254 750 fx. I just checked that part number on the part fixed to car which looks suspiciously identical to this.
Also I was given the same part number by local audi dealer when I asked for the "dpf" part number ( I am able to get part numbers from one dealer now, long story ) and gave them my registration number.
On last audi dealer service I asked them to force re gen of "dpf" they told me it wasn't needed as it showing as only 30%.
Last independent to look at car also noted that he was surprised the "dpf" was in such good condition as he see's lots of issues on 170 s with regards to dpf.
The guy who did my terra clean said after the treatment "I've done you a forced re gen of your dpf mate just for good measure"
If you google the part number above all you get is dpf. I hope I'm wrong here as that means happy days as far as remapping mot/insurance worries after re map.
If anyone has access to etka to check what this part number comes up as I would like to know because if it ain't a dpf then some mechanics have some explaining to do!!!