Hi Everyone, I recently joined the site as I am going to buy an A7 BiTDI 313/320bhp on a 2014/2015 plate in approximately 8 months time (moving away from Mercedes for my first Audi). I am researching the model to find out which mods I may decide to do and what issues I may encounter. One particular mod of Interest is the muffler delete. Is this just a case of replacing the back boxes with a straight through pipe or does it require a mod in the ECU as well? Would there be any need for a sound module afterwards or would this be a waste of money? After getting used to the car and seeing how it performs, I may opt for the Stage 1 remap and DPF Delete. I can't think I would need to, or would want to go any further than this. Maybe a K&N filter? Thanks, Steve.