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As has been discussed already on this forum, the headers appear horribly designed, and it's a complete mystery to me why they are putting cats in both the header and the midpipe, when only set is required to avoid CELs when running the US DME program.
Also, I don't know if anyone has commented on whether or not the system has resonance issues, but looking at the sheer simplicity of the design, I would guess it likely suffers from them.
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Boxster S
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