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Are you already running the UEL tune?
P0171 is too lean on bank 1
P2097 is too rich on bank 1
P219A is a/f ratio imbalance on bank 1
These cars only have one bank for O2 sensors, so you can ignore the bank 1 part. If this wasn't happening before the header, it's pretty safe to rule out the MAF.
Are you getting all three codes back, or just the lean code?
Did you install the header, or have a shop do it? If it was done at a shop, I'd go back and ask them to check for leaks and to make sure both O2 sensors are plugged in and in the right locations.
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