I thought I'd chime in here since I have a UEL header from Borla. All I did to ensure I didn't though a CEL from the cat delete is to move the O2 sensor about in inch away from the exhaust flow. I placed the O2 sensor into a Spark Plug Non-Fouler that I bought at AutoZone for 4bucks. (
http://www.autozone.com/autozone/par...er=720805_0_0_)
I found this video on youtube that pretty much explains the process. This is not an FRZ/BRZ in the video but it's the same thing I did to move the 02 sensor: [ame="http://www.youtube.com/watch?v=GqDmmLQ4pGk"]Clear check engine light for less than 5 dollars - YouTube[/ame]
I've had the headers on my car for about a month now, no CEL.