I have a d16z engine turbocharged boosting at 0.5 but have consistently giving problems each time i rev over 5000 rpm....especially after 3rd gear. I've consulted a few workshop and had many different answers....however, two of them told me that it is my stock ECU and MEP sensors which are the cause of the problem. This is because they can't read the additional air that is pushed in by the turbo.

How true is it? Opting for a programmable ECU like HALTECH seems a little overkill for this problem.....does anyone here have any opinion. Would relly appreciate it . Thanks