You should remove the catalytic converter, remove the muffler assembly and remove the left front
Floor Panel exhaust heat shield nuts and heat shield. If the vehicle is a Tahoe, Yukon, Yukon Denali, or Escalade, you should remove the exhaust heat shield nuts and heat shields. If the vehicle is a Suburban, Yukon XL, Yukon Denali XL, Escalade ESV, Escalade EXT, or an Avalanche, you should remove the exhaust heat shield nuts and heat shields and then remove the rear floor panel exhaust heat shield nuts and heat shield, as required.