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How crazy do you want to get? If you just want better sound then get an axle back. I’ve got an AWE and it sounds fantastic. I hear great things about Borla and others.
Beyond that you run into issues with the structural cross braces under the car that get in the way of a cat back system (unless you have some custom work done).
And as previously mentioned, switching from dual tips to quad tips means replacing the diffuser also.
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