Nameless Performance Single Exit 2.5in Track Pipe w/ 4" Double Wall Polished Tip 2017-2021 BRZ / 2017-2021 86

This is their track pipe for the new BRZ/FR-S. The intent behind this is to provide the lightest option available for an axleback. 

This race pipe weighs in at an anorexic 3 pounds. Compare that to the stock brick of a muffler that weighs 26 pounds and you save 23 pounds.