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Originally Posted by fu03steve
so a better solution is probably to keep the cat by the muffler...
and remove the first cat along with the headers?
would that be better?
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Here's the deal. If you want to avoid a CEL then you need to keep your stock manifolds or pay $2,300 for the Fabspeed headers I listed a pic of. The other main cats down stream by the muffler can be removed because there are no 02 sensors by them. Essentially the computer doesn't know if those cats are there or not. Here's a pic of the stock Porsche manifold that che's headers replace and all the others on ebay like his. If you replace this manifold with one without a cat then a CEL is likely. This is why companies like B&B don't make headers for 2000-04 boxsters. They know it will cause issues. The 2.5L guys however are in the clear and don't have to worry about all this stuff.