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Well that's certainly a catless aftermarket header to start with, not certain which brand. And the fact that you also have the Injen cold air intake tells me the car also has been tuned, (OFT, EcuTek, etc.)
Did they provide you with any details about that? I'll bet the exhaust mods don't end with just the header.
Take a pic of the exhaust tips, that may provide a clue as to which cat back/axle back you have.
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