Funny, I was thinking the exact same thing yesterday. I sent a PM to KRZTACO since he had done a custom Magnaflow system on his Boxster. He responded saying he used some 4x9 mufflers. He did not post the exact model number. The Magnaflow website shows a few different 4x9 mufflers. I was just going to go to my local shop and find out which one would work best.
Hope that helps.
-David
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