4″ (101mm) 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 800G
Collar ID 101.6mm, Center ID 95mm, Sleeve 1.6mm thickness
Length: 103.4mm O/A, 15mm Collar each end