WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Exhaust Pipe Bolts Removal Sequence
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust pipe bolts in the proper sequence.
Fig 2: View Of Right Exhaust Pipe
Courtesy of GENERAL MOTORS CORP.
Remove the exhaust pipe, exhaust outlet bracket and gaskets.