According to my AI search, North Carolina does not test for emissions after 20 yrs?

Install the EU2 tune and run headers. The EU2 tune will turn the check engine light off although codes can still be recorded and read. I did this to my 2005 E53 due to cat efficiency codes...MA only tests for emissions for 15 yrs.

They're not likely both clogged. So sell them to help defray the cost of the header tune.

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'99 E39 528i 5-speed 130k
'06 325Cic auto 115k
'05 X5 3.0 auto 173k-SOLD
'03 530i - manual swapped - 430k miles-SOLD