Vibrant Performance Collector Slip On Merge Collector 2 into 1 2 1 4 in Vibrant 4 1 Stainless Merge Collectors 4 1 SS Merge Collectors (2 Inch Inlet Slipover ID, 3 1 2 Inch Merge S2eac37ca84524bafadd2b6e1c0e29f84J.jpg Vibrant Merge Collectors 21 SS 2in Outlet OD Sold Individually eBay. 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.