AFE 46-51001 BladeRunner GT Series Engine Coolant Expansion Tank for 15-23 300 / Challenger / Charger 6.4L 392 & 6.2L Hellcat. Enhance reliability and style in your engine bay with the aFe POWER BladeRunner GT Series Aluminum Expansion Tank. This 100% TIG-welded aluminum tank features billet aluminum fittings and a convenient sight tube with stainless steel fittings, and it fits seamlessly with the factory expansion tank cap.