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I currently have stock headers and FabSpeed's system on my S. It sounds great and I have a feeling it does flow better than stock. However, it does resonate between 2 and 3k which drives me nuts.
I have been considering TurboWerx's headers as they are beautifully made, B&B makes a nice set as well. If you want catted headers the only option are FabSpeed but they are $$$.
The issue with the CEL confusion and the 4 O2 bungs is this: the OBDII section of the DME expects to see different O2 levels pre and post cat to ensure catalytic efficiency, so having 4 O2 bungs in a non catted header is sure to get you a CEL. What you can do, is keep the factory secondary cats, or get high flow catted midpipes, and install a bung AFTER those cats and extend the wiring for the post O2 sensors. There will be a slight difference in resistance due to the added wiring but it SHOULD be ok.
I believe there are also some software reflashes that remove the catalytic efficiency monitoring, but I am not sure.
I would like to get the FabSpeed headers but I am simply not paying $2500 for them. My current plan is to get either the B&B or TurboWerx headers, and have my local custom shop remove the resonators from my FabSpeed midpipes and weld in high flow cats, and install my secondary O2s after those with extended wiring.
I'll keep you all posted if/ when I get around to this.
Patrick
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