Fairfax county emissions and midpipes

turo · 01-11-2025, 11:31 PM

Hey all,
Quick question. I’m looking to get a milltek midline which, I believe, replaces the secondary cats. Is this going to cause issues with safety/emissions inspections in ffx coubty (Herndon)?

Thanks!

M2M3M3 · 01-13-2025, 12:54 PM

I would say "maybe". i should not show as a flag in the OBD, but the tailpipe test may fail without the secondary cats doing their thing.

NovaChris · 01-14-2025, 09:41 PM

I’m in the same boat, I’m planning on getting it emissions tested at my shop that does everything. Figured it would pass but maybe fail visual inspection and hopefully they don’t look that closely

01-11-2025, 11:31 PM	#1
turo Lieutenant 226 Rep 495 Posts Drives: Yes Join Date: Jul 2011 Location: North VA iTrader: (2) Garage List 2011 BMW 335i [8.40] 2024 BMW M2 [9.00] 2018 BMW 340i XDrive [10.00]	Fairfax county emissions and midpipes Hey all, Quick question. I’m looking to get a milltek midline which, I believe, replaces the secondary cats. Is this going to cause issues with safety/emissions inspections in ffx coubty (Herndon)? Thanks!
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01-13-2025, 12:54 PM	#2
M2M3M3 waiting.... 204 Rep 174 Posts Drives: 95 M3, 97 M3 Join Date: Nov 2024 Location: NOVA iTrader: (0) Garage List 97 E36 M3/4/5 [0.00] 95 E36 M3 [0.00]	I would say "maybe". i should not show as a flag in the OBD, but the tailpipe test may fail without the secondary cats doing their thing.
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01-14-2025, 09:41 PM	#3
NovaChris Private First Class 280 Rep 210 Posts Drives: '23 M3 Join Date: Aug 2020 Location: Nova VA iTrader: (0) Garage List 2020 Ford Explorer [0.00]	I’m in the same boat, I’m planning on getting it emissions tested at my shop that does everything. Figured it would pass but maybe fail visual inspection and hopefully they don’t look that closely
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