Having a vehicle that is intended for competition is not an easy task, you must ensure that every aspect of your vehicle works properly and with one another to have a balanced and competetive vehicle. The powerplant must work with your drivetrain and your drivetrain with your suspension, and your suspension with your chassis. One of the biggest parts of the powerplant system that is overlooked is your cooling system.
Many tuners will tell you how crucial your cooling system is to not only the overall performance of your engine but the durability and reliability. Most modern engines are cooled via an Liquid-Air cooling system. Most common upgrades are upgraded radiators that are more efficient, electric fans that have higher CFM's, caps that have higher pressure releases and hoses that have higher burst-pressures as well as less expansion. With all these upgrades available, most people still forget that a cooling system must be properly maintained and monitored.
The reason your cooling system is pressurized is to increase the boiling point of your coolant