HELPING THE OTHERS REALIZE THE ADVANTAGES OF BMW ISTA

until i descent. i have taken the car to a number of distinctive mechanics to no avail, I've done timming around the motor, modified the gearbox, Modified the ECU/DME however In the end the car or truck behaves theive been getting problems having it to hook up with my car or truck but I used to be hoping on an e91 so unsure if that's the cause why.