I know it sounds crazy but i need to do it. We have a 2007 LMM at work we are going to sell and the boss man want the Stock exhaust back on to sell it. So im thinking no big deal right!?!? WRONG! I got everything back were it need to be. Plug EFi in and set it back to a stock tune. Start the truck up and on comes the check engine light and in the CID it says clean diesel exhaust filter. So i hook Efi live back up go to scan tool and then too DVT and try and reset the DPF log and force a service regen and it keeps saying it can't connect. Any one have any ideas? I'm stumped and don't know what to do......