Not sure how you define stock? Have the injen intake and eibachs and other night was 4.2 and 12.9 followed by a 4.4 at 13. Was about 38 degrees on a freshly black topped road... Pirellis didn't hook up so wasn't my 3.9 but I will take it...
"Dark Shadow"- 2014 Jeep GC SRT
BT Catch Can, InJen CAI, Tint all around, debadged, Tinted tail lights, Vinyl Wrapped Window Trim, Eibach ProKit, Black Powdercoated Borla ATAK, 87mm TB, CFR front splitter, Cross Drilled Brembo Sport Brakes w/Hawk Pads