OK I guess this may not be an option for people who still need to pass state emissions.
As for e39 SAP... I know what the coding does and may have used the wrong term but my point was there are tuners who can make it pass emissions with a fault in the system.
I'll reevaluate when in another couple years when I hit 100k and something fails

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2012 X5 35D - EGR delete and Stage 2 tune
2003 M5 - Imola/Caramel, Dinan S2 suspension, Alpha-N tune
1990 M3 - CF Airbox, Alpha-N, Schrick 284/276 cams, VAC S2 head, full GC suspension
1991 M5 - Black/Black - stock
1991 325iX - Winter beater

Retired: 1999 328is 5MT, 1994 525i 5MT, 2003 530i 5MT, 2012 X3, 2006 325i 6MT, 2001 M5