When I first tried to hit the limiter in my car I hit 118 mph in 4th gear. I don't think the 115mph limiter is always true to itself... Could this be a 2012 add on? My car is a 2012. OP what year is your car?
2012 3.7L V6 Black MT82 / Smoked Taillights / 15% Tint
Boss 302 Steering Wheel / Black Billet Grill / Airaid Cold Air Intake
GTCS Pedestal Spolier / Pypes Pype Bomb Axleback Exhaust