You will want the DSX Flex sensor because pump E85 is inconsistent.
It can have anywhere from like 51% to 85% Ethanol according to the sticker on the pumps I use.
The most Ethanol I've ever seen in a log file was 79%. I've never seen higher at any E85 pump in TN.
No way a tune can compensate for that much of a variable.
Read:
https://www.autoblog.com/2007/02/27/...ith-an-e85-st/
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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