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If you leave the Euro headers in place and reinstall the stock NA section 1 there will be nowhere for the EGT or post-cat O2 sensors to go. Probably easiest to go to your "guy".
In the NA headers are CATs that, as I understand, only work during the first few minutes after start up until the CAT in the section 1 gets up to temperature. There is no cat in x-pipe.
Also, currently I'm running NA headers and the DKF with just the resonator in place. I believe someone on here recently said that setup just barely passed CA smog but recommended ensuring that the CATs were good and hot before performing the test.
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