Wanted to inform any one about welding on the xlr. After researching and calling a couple muffler shops about procedures on welding on the car. Was told should leave the batt. Connected first to not loose any settings. The batt. Should act like a sponge if theirs any spike within the system. Unless you plan on disconnecting ALL modules because they are all connected via grounds theirs no point. Was told that today's modules have " blockers" that control or block any surges. Only precautions to take is put ground straps as close to weld as possible and even put another to isolate welding area. Was told that this only applies for dc power and tig high frequency has to much voltage. After doing a lot of praying I sucked it up and did what I had to do and let me tell you didn't have ANY problem's. After finishing took the car for a ride and haven't had any problem's.