I was installing my new JBA exhaust today and used FJ cruiser forums to guide me along. I noticed that a lot of people used a saw to cut off the stock exhaust because the bolts at the rear of the muffler are a pain to unscrew. I played around with a couple angles and found an easy way to unscrew the bolts using a long torque wrench and 2 inch extension. I could then get enough leverage by going in through the opening above the rear axle. Both bolts should be accessible this way.