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What about warranty. I had heard you can get away with cat backs but once you put headers or sport cats on you would not be covered. Any truth to these comments or evidence of this? I too just bought a new C8 and wondering what way to go, sport cats or cat back. I really like the fabspeed maxflo, but would prefer something with a better price point that achieves better or equal sound.. I want to have the valves work and no CELs