Performance Exhaust and Header for Boxster

[fu03steve]

Originally Posted by Adam

Yeah, it probably will. In layman terms the sensors that were aft of the cats will sense too much pollution and think your cats are not functioning properly so there's a good chance it will trip a CEL light.

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?

[Adam]

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?

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.

[fu03steve]

Originally Posted by Adam

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 remove 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.

oh i see!! thanks for the explaination. so the secondary cat ( by the muffler ) is save to remove and replace with test pipe... but there have to have a cat by the exhaust manifolds... i see...

[CJ_Boxster]

Steve... Im going to hit you!

You cant remove any of your cats without getting a CEL... You can remove the secondary cats IF and ONLY IF you have ROW settings flashed into your ECU or have revo flash your ECU to ignore the input from the last sets of o2 sensors.

If you look at the image, the cat on the right side has an O2 sensor screw in behind it so its expecting cleaner exhaust.

This is where the o2's are bolted to my exhaust on my 2.5.

[Adam]

That diagram has me scratchng my head! It shows 8 02 sensors!! That diagram is screwed up! You should be able to replace those cats no prob.
[IMG][/IMG]

[CJ_Boxster]

Originally Posted by Adam

That diagrahm has me scratchng my head! It shows 8 02 sensors!! I don't think that thing is right. You should be able to replace those cats no prob.
[IMG][/IMG]

That image is from the porsche parts cataloge, its just showing all the possible locations an o2 sensor CAN go.

[Adam]

Yeah, I see it's trying to show both the old 2.5L system and the later system together. Confusing!!