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A 3" cat-back should not cause any real issues, but is not really needed. A full 3" exhaust on a NA car would cause a loss of low end power/torque and that is definitely not what this car needs. I also own a built 2003 Mazdaspeed Protégé. When I put the 3" turbo-back exhaust on it, I definitely lost some low end power and torque. It did gain more than it lost, but only at full boost and high rpms.
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