It sounds like you have made some modifications to the New Holland T8 tractor to increase its horsepower. The new values you provided are as follows:
- Power: 351 hp
- Max Speed: 50 km/h
- Price: $392,000
This increased power and speed will likely provide a boost in performance for the tractor, allowing it to handle more demanding tasks effectively. It seems like a significant upgrade for the New Holland T8 model. If you have any more details or features you'd like to discuss, feel free to share!