I'm still using the AJM engine with the DC mass airflow sensor and I don't notice any difference compared to the original.
The maximum speed is also reached.
According to the speedometer, it was 205 km/h, and going downhill, it was even around 218 km/h in 6th gear. (There's still more to come!

)
http://www.goffel.de/sinsheim/241.JPG
EDIT: For information: The odometer shows 110,438 km. However, a new engine was installed at 65,710 km. At that time, the replacement engine had 44,728 km on it.
The DC air mass sensor was approximately 4000 km old.