For anyone who's still curious, I have a write up on installing my 02 sensor on my header, and there are a ton of pictures here. May help you get an idea of what the FSwerks header is like. Also, I added a 2nd 02 sensor in the flex pipe, so you can see what that looks like. If you have any questions, PM me.
Originally Posted by Deftmetal
the red door is required by some race rules to identify the driver
ROTM June '13, PNW Crew #42, SR #245, Rally Rev #02