DPFs in general are a lot more than an add on like a catalytic converter. They have pressure sensors to detect their status and as they become blocked the ecu initiates a burn phase by adding more fuel to burn off the soot. 
I don't think your dealer would be able to retrofit a genuine DPF.
There is an alternative though. An Australian company sells a DPF that is sold for use on underground mining vehicles, it could be retrofitted.
I have the website bookmarked on my work PC. I will post it later today.
				
			 
			
		 
			
				
			
			
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