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I am curious to the responses also, I asked similiar question without much response.
My theory is headers with 200 cell cats, into the cat bypass. Will be a little louder, but will be breathing well, and the stock muffler will keep it toned down. At least in my theory.
Since you increased the input flow, it needs the exit to flow better. But this off my knowledge of 350 V8, but principles should still follow.
Concern would be how much back pressure to keep the bottom end torque nice. I would think stock muffler would work well for that.
Anyway curious to responses too.
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2000 Boxster S Ocean Blue Metalic
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Threaded Mode
