X-pipe, Tuning and passing emissions

rubicon1976 · 08-07-2023, 05:11 PM

I recently purchased a nice used 2008 E93 M3 6MT and I would like to do a stage II tune like the one BPM offers. I live in SE Denver area in a county that requires emissions testing. What are my options? Would I have to keep my stock pipes/cats and just put them back in along with the stock tune every other year when I have to pass emissions? I am not even sure if I will have to pass a Dyno emissions test or a OBDII test only.

Any advice would be appreciated.

Ervin87 · 08-07-2023, 08:24 PM

Yes, you will need to revert back to stock, get all the emission monitors ready (not fun), and then smog the car

jp1984 · 08-10-2023, 02:01 PM

In my state you are allowed one monitor to be inactive. You can code this yourself with ECU Werks or have a tuner code it for you. This only works if they dont do sniffer tests though, and I know places like CA actually does a check sum on your software. <= that is brutal, no way around it except back to OEM tune and OEM parts.

How old do cars have to be before they are not applicable to these laws, 25?

08-07-2023, 05:11 PM	#1
rubicon1976 New Member 39 Rep 26 Posts Drives: 08 E93 M3, 09 E92 335i Join Date: Mar 2021 Location: PARKER, CO iTrader: (0)	X-pipe, Tuning and passing emissions I recently purchased a nice used 2008 E93 M3 6MT and I would like to do a stage II tune like the one BPM offers. I live in SE Denver area in a county that requires emissions testing. What are my options? Would I have to keep my stock pipes/cats and just put them back in along with the stock tune every other year when I have to pass emissions? I am not even sure if I will have to pass a Dyno emissions test or a OBDII test only. Any advice would be appreciated. __________________ 2008 E93 M3 6MT, 2009 E92 335i, 2009 E93 328i, 2014 X1 28i xdrive.
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08-07-2023, 08:24 PM	#2
Ervin87 Captain 561 Rep 617 Posts Drives: E92 M3 \| B5 S4 \| E30 Join Date: Aug 2012 Location: Santa Clara, CA iTrader: (5)	Yes, you will need to revert back to stock, get all the emission monitors ready (not fun), and then smog the car
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08-10-2023, 02:01 PM	#3
jp1984 Lieutenant 508 Rep 550 Posts Drives: an E92 Join Date: Jun 2019 Location: under the hood again iTrader: (0)	In my state you are allowed one monitor to be inactive. You can code this yourself with ECU Werks or have a tuner code it for you. This only works if they dont do sniffer tests though, and I know places like CA actually does a check sum on your software. <= that is brutal, no way around it except back to OEM tune and OEM parts. How old do cars have to be before they are not applicable to these laws, 25?
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