This upgraded high-capacity aluminium header tank for the Lotus Exige V6 and Sport models offers a number of performance and aesthetic upgrades over the OE version.Increasing the cooling system's fluid capacity aids cooling performance, and the  header tank increases the volume considerably, from 1000ml to 1700ml, as well as increasing the cap pressure from 15.66psi to 21psi.Unlike the OE tank, this version will not crack or discolour.Finished in our standard textured black, each tank also includes a sight glass for easy coolant level checking as standard.Compatibility: Lotus V6 Exige S and Sport Models 3 Eleven Road, Race and 430 Evora (S) 400, 410 Sport, GT410 and GT430

Every pressurized system needs a protection mechanism to prevent it from building up too much pressure.If the system builds up too much pressure (or the cap gets stuck) something has to go.The weakest part will be the plastic side caps at the radiator, so they will blow. You can’t really blame that on the design of the radiator if you’re not sure about the pressure in the system.Our rule of thumb lifespan for a Coolant Reservoir Pressure Cap is two years. From there, it will either start to get loose (boiling, temperature going up manically) or it’ll get stuck (radiator or pipes blowing up).Think about it, this cap is easy to replace, it’s cheap compared to the original part. It simply is disaster prevention! This cap is suitable for all Elises, Exiges and Evoras with a Toyota drivetrain.