Hello guys im a noob! i have been tuning for 2 months, i am working in a car workshop, i am facing common problems like dpf removal egr removal, i find egr removal easy but i always have problems with the dpf, when a car for a dpf removal i have an experienced tuner to do it for me, but i really wanna start understanding it. I am using softwares like ecusafe,egr/dpf remover and than i correct the checksums it works with the egr but not with the dpf there are some cks correction i read somewhere if someone can explain what are these corrections and how are they made. Also i have a question bout the cars that need original files for comparison how to get/make this original file. Thanks!