2.5″ (63mm) 304Grade Stainless Super flow Flex Bellow (Flex joint) with an Inner sleeve
The Idea behind these flex bellows is to allow the exhaust to flex, this greatly reduces the stress on the whole exhaust system minimizing the chances of welds/tube cracking.
304 Grade stainless flex bellow, light weight at a measly 370G
Collar ID 63.57mm, Center ID 53.3mm, Sleeve 1.6mm thickness
Length: 77mm O/A, 12mm Collar each end