Adding to Jimbo's comment (Btw- hello!!) relocate your IAT sensor along with good cooldown.

04 had ls1 05-06 had ls2

is this the ls1 or ls2 sorry dont know much about new gto's

Get stickier tires and work on your 60' ft. You should be in the mid to low 13's with that car stock. Also dont forget to let it cool down in between runs. Bigger burnout with lower tire presure is your friend. Nice looking goat though. Great color.