just put on my steeda cai and 93 octane tune power combo, install is a breeze on my 2012 gt along with the download and whole process, ordered everything on a tuesday from steeda and got it 2 days later, sent in my sct and tune info to Matt and got it back the next day, first impressions are excellent,just went for a 15 minute ride,cruising easy with and without the a/c on, ran and idled just like stock, no surging,pinging,NOTHING negative! Then i got on it, THAT INTAKE SOUND is intoxicating and it pulls to redline like a freight train making the sweetest sound, i,m sure it will get much improved mpg to if i can keep my foot out of it!!! Only mods were gt500 a/b with resonator delete. Very satisfied customer as always with STEEDA, have steeda springs,sway bars,torque box brace,g force brace etc. etc. I know there are more powerful tunes out there but i,m very happy with this SAFE and powerful tune for my daily driver!!