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you should probably post a pic of what you have under there - caymans typically have a crossover pipe already (one of the easy cayman mods on the stock exhaust for better sound is to shift the joiner pipe on the crossover such that a bit more sound gets out).
what folks do here is use easyseal exhaust clamps to ensure positive seals and most report an improvement. i went straight to easyseal when i put mine in and no drone on full cheap chinese system (catless headers, catless mid pipes, twin can exhaust).
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