I run 2 AEM widebands.
Definitely good insurance on boosted or nitrous cars to see if your going lean on 1 bank because something like a failed injector.
I screwed up one of my cat pipes in my Kooks system that caused an exhaust leak.
Caught it right away as my bank 2 wideband was showing erratic AFR on the lean side.
The Widebands back when I had BBk o/r mids.
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2010 2SS RS A6 781rwhp on E85
Stage 2 ProCharger D1X
Circle D 3400 Triple Disc
Kooks Jet Hot Headers
Kooks Full 3in exhaust
Trick Flow GenX 255's
Polished PAC .660's & Ti-retainers
TSP VVT 3.2 cam kit w/DoD Delete
Smith Bro's Trunnion kit
AEM X-Series OBDII Widebands
FIC ID1300x Injectors
GM ZL1 High Output Fuel Pump
DSX Tuning Flex Sensor
DSX Auxiliary Fuel System
Tim King Stage 4 Max Effort CTSV 6L90
DSS 1 piece aluminum driveshaft
JRE 6L80E / 6L90E Dipstick
NGK Iridium IX spark plugs #7 heat range
Mighty Mouse Camaro 5 Wild w/-12an and Billet Black
HP Tuners VCM Suite