Ball Flange Kit 2.5in to 2.5in Pair Exhaust Accessory Exhaust Flex Joint Header Collector Ball Flange Kit- 2.50 in. to 2.50 in. - Pair - requires welding N/A Pipe, Exhaust, Headers, Adapter, Collector, Performance This header collector kit takes the place of three bolt flange type connections and allows for a leak free and gasket free ball flange type connection. Available in various sizes. Universal Item G?? Not a direct fit. Some adaptation required.