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The outer diameter of the outlet of the catalytic converter is 1.8" on all 986 Boxsters. This is roughly the same size as the inner diameter of the muffler inlet pipes.
As I say to everyone who starts building their own exhaust: don't. The factory muffler is tuned with length and chambers so that it doesn't have any unpleasant tones. It's extremely difficult to acheive this with off-the-shelf parts. I can guarantee that whatever you construct will drone horribly between 2,000 and 3,200 RPM and that you'll tire of it quickly.
Good luck...
Last edited by John V; 01-11-2008 at 05:05 AM.
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