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Easy: buy or borrow a thermal camera. Start the car, point the camera at the suspect area. the exhaust leak will be obvious. More difficult: check for obvious holes or cracks or loud noise in exhaust system. Easiest of all: take car to a muffler shop, they will shoot you an estimate, maybe for free.
Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.
This seems to be a classic case of "disentegrating exhaust system syndrome." There is either a hole(s) somewhere in your exhaust system or there is a leak somewhere. Probably the easiest way to tell where the noise is coming from is to start your car and just listen around in the engine bay, under the car, and at the muffler. Also do a visual inspection of the exhaust system to see if you can see any holes in the piping. I have also seen hairline cracks in the exhaust header itself that can cause the loud ticking noise that can be a little tricky to track down.
My 2005 GMC 2500HD (8.1 lt) had the same problem. I just had an exhaust leak fixed today. The right front manifold bolts were broken and the manifold was warped. The repair was 6.5 hours labour plus gaskets, seals, bolts and the manifold machining (parts were $130 CDN).
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