That sounds like an exciting modification for the Case Magnum T4B in FS25! It's great to hear that the engine has been revised to provide a power range from 374 to 1000cv. Additionally, having a wide selection of color options can really add a personal touch to the tractor.
With a maximum speed of 73 km/h, this modified Magnum T4B should be able to cover ground quickly and efficiently. The versatility in power output also allows for flexibility in tackling different tasks on the farm.
The basic price of 350,000 € seems reasonable considering the enhancements made to the tractor. It would be interesting to see how this modified Magnum T4B performs in various farming scenarios in the game. Overall, it sounds like a promising addition for players looking to enhance their farming experience in FS25.