170 to 176 would be the max top speed of the duke 390. If you install an aftermarket ECU like powertronics then you can expect a bit more, but I am not sure about the ECU kit.

KTM India launched the 890 Duke R in the country ... paired with a six-speed transmission. This engine belts out 128.2 bhp at 12,000 rpm and 80 Nm of maximum torque at 9,500 rpm.