Could somone tell me which e-manage is most customizable? Currently i have a Unichip for which i can't find a tuner, I am not sure how mutch more can you tune it and what can you tune with it. I know Greddy has a e-manage for scions and Aem as well. I plan to get a custom exaust piping done so i want to make sure that there is a better ECU out there for scion before i install it and tune it properly.