Radium Coolant Expansion Swirl Tank - Lotus Elise / Exige 2006-2011 (2ZZ-GE)Radium Coolant Expansion Swirl Tank Lotus Elise Exige (2006 2011, 2ZZ GE) Suits: 2006 2011 Lotus Elise 2ZZ GE 2006 2011 Lotus Exige 2ZZ GE The Radium Engineering Coolant Expansion Swirl Tank is a remote mounted header tank designed for custom Lotus applications including engine swaps and turbocharger kits where the OEM expansion tank is no longer in an ideal location. Essential for applications using a low mounted radiator such as a V mount, where