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The second o2 sensor just tells the ECM the pre-cat there and working. It won't affect your A/F ratio. It gets "tricked" into thinking it's still in place by being recessed further back.
If Mark is out and you can't wait and desire high quality, go w/ the Nismo. But your going to pay a pretty penny. A lot of my off forum friends support the Nismo header as they claim it has the best collector out of them all.
I think the XS header will suffice if your willing to wait.
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06 2.5S | NISM0 - INTAKE, OIL CAP, RADIATOR CAP, BRAKE PADS | 18x7.5 MAXIMA RIMS - 225/45/18 KUMHO ECSTA SPT | 20% TINT | EIBACH SPORTLINE | RACINGLINE FTSB | SE-R XENON HEADLIGHTS |
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