Since June 2007 my signum has a DPF of the company GAT. advertised and installed with car part Unger. 1. Has already someone experience with regress requirements towards ATU. How should I/we proceed – in writing is clear – RA as last help too! Perhaps there are already sample letters or sample lawsuits. Including the refund of the additional expenses (working time, registration registration, ….). 2. What happens with the HU with the not permissible DPF?? Detachment, again to the registration position e, …. new costs. 3. If there are already experiences with sogenant improvements, including the costs. 4. If someone has a list of exactly affected DPF – according to type designation – or if someone knows where it is visible. The media landscape writes a lot and nonsense. Please answer, which I want to assert my claims – experiences from this will then of course be discontinued. Your FixFax