Hi guys,I got a letter from Kraftamt Bundesamt,it says my volvo v40 2003 bj has only a yellow badge and I would like to install a DPF to get the green badge,for that I get a promotion of 260 euros.And now comes the question, what does the conversion cost?It will certainly cost 600-700€,and what does the green badge save me that I can drive into environmental zone…