I have a 2013 GT and noticed the first day I had the car that during a hot start it would lug out sometimes just above idle RPM when I would put the peddle to the floor to rap out the RPM's. I was told by a Ford racing tech it could be the delay of the throttle cable or some **** but that isnt a real plausible explanation for me as it doesnt do it every time and does not do it during a cold start. There is no tune and nothing done except Roush axle back exhaust and it did it before I put the exhaust on. The car has less than 500 miles still and I am running premium fuel...... So I am curious if someone else has had a similar issue and if some people who are knowledgeable with these cars or cars in general can tell me why this is doing this.