I went to the dealer in seattle, and said that my part is arrived. But one of the tech said that if I get new Ecu it will fix the hesitation but shift much harder. Also he said I never can go back to original. Should I upgrade or not? Did everybody satified with their new ECU uppgrade? I don't want to uppgrade if it will shift really hard. I have an appointment on Tues so i got some time to think. Please feed back please!!!