Well i've been for a blast in chris's car when he had the ct9 on and it seemed to hesitating around 4-5k then go mad all the way to the red line! I just think it could be the map on the KS-ROM abit like the mk1 focus RS they have a 5k missfire all on the 03 models due to the map ford put on them! the only way to get rid of the 5k misfire on a RS it to get it mapped! But that cant be done on the KS-ROM