I think it's the chin spoiler that's different, like on my ecoboost PP I changed the chin to the GT PP but your supposed to order the GT belly psn with it. I didn't, I just modified mine and made it fit, but the other option was just ordering the steeda chin splitter and using that instead with the GT PP chin spoiler.
So in conclusion you should order the GT PP lip with the steeda chin spoiler, which is really just a belly pan that extends forward anyway, if I'm wrong someone correct me, but I don't think I am. It would look much better if you switch to the bigger lip, plus I don't think it matches up properly unless you do,but I fabbed my belly pan, I'm sure you could make your setup work.
