Join Date: Oct 2001
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Is it an old style z71 or new style? Because the 5.7 vs 5.3 will sound a lot different i think.
And if its an old style 99, its a "direct fit cat" setup, so the tubing with the cats bolts onto the rest of the exhaust system. Therefore, you could just crawl under there and unbolt the rear of the exhaust, and depending on how its supported, disconnect the rubber hangers and remove the tailpipes/mufflers completely and see how it sounds. It will be a little louder than running pipes out the back, and i wouldn't run with no tail pipes for very long, but it would give you a good idea what it is going to sound like.
I'm not sure where backpressure builds up in an exhaust system, but if its in the muffler/tailpipes, you will loose backpressure and your low end torque at the same time when you remove that stuff.
Sorry for the long post, hope it made some sense.....