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996 C4S X51 Manual - Exhaust Replacement - Advice Request


CJC
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Update.

The system breathes a lot better with the X Pipe and 200 CEL cats compared to the original cross over pipes. Bit more of a burble just off idle (much like a V8 speedboat at idle) and a bit more raspy above 4,000/4,500 rpm. Much more willing to rev, and noticeably faster.

Haven’t had the need to hit the PSE switch to activate the actuators and close the valves to quieten it down (although I tested this to make sure all is well, and it was working nicely). I would put it into quiet mode on the highway.

I expect the new Bosch O2 sensors have also made a difference in efficiency. 

Will try and take / upload a video. 

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