I have an 06 GTO, with the SLP skipshift eliminator , works great , no 1>4 shift light anymore required.
sorry but someone kept saying 1-2, it is a 1>4 skip shift, and it triggers from doing shifts at low speeds, for feul economy. $25 and problem solved and 5 minutes to do. goood palce to start with a new goat.
06 GTO, M6 . SLP Skipshift, JHP Binnacle Guage Pod, GMM Ripshifter, SLP Lt's with Cats, SLP catback LM1,Raptor Shiftlight,Pedders Drag Springs 5/16" lift.