2 in 1 Kollektor 44 auf 51mm Abgassystem Kollektoren 2 in 1 Collector 44 to 51mm Collector for pipe manifolds Collector for long pipe manifolds This type of collector is used for long pipe manifolds. The collectors are widened for a plug-in connection of the pipes via our weld-on brackets excluding broken weld seams from start. Pure motorsports technology! Inner diameter inlet: 44mm Outer diameter outlet: 51mm