I got a bullydog gt gas tuner and it's decent for fuel Milage and power but this one came on kijiji amd I might pick it up when I'm out of town next week is it compatible with a 2013 5.0, he sais 2011model so idk and is it an upgrade from the bullydog

 

If it's a x3 3000 model then it's custom tune only as won't work right out of the box, will need your own custom tune as well written for your specific truck. If it's a sf3 3015, you can use one of the three preloaded tunes on it for your truck or get your own custom tune as well. Does it say preloaded flash device on front? If so, then it's a sf3 3015. If it says custom tune only then it's an x3 3000. And of course , make sure it's unmarried from his vehicle first otherwise it's a $150 fee to SCT to get them to unmarry it