Vibrant Performance 10303 VIB10303 4 1 S.S MERGE COLLECTORS (1.75IN Vibrant 4 1 Merge Collector 2.375in Inlet I.D. Merge O.D. 3.50in Exhaust Fabrication Parts & Components MAPerformance Tagged "Merge Vibrant 2 1 SS Merge Collectors (1 5 8in Inlet Slipover ID 2in Outlet S9617e5eda6184f0d8fa79d7e24e13ae0b.jpg Vibrant 2 1 SS Merge Collectors (2 1 2in Inlet Slipover ID 2 1 2in. Vibrant Performance has developed a comprehensive, high quality and Affordably priced range of 304 Stainless Steel Merge Collectors to help our customers free up maximum horsepower from their exhaust setup. For many years, merge collectors were almost exclusively used by top professional race teams. However, this proven technology is now commonly used at all levels of professional racing (where rules permit) and now many fabricators are incorporating merge collectors into street header applications.