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Universal 4 into 1 Turbo Manifold Merge Collector (fits all T4) (2453) by Vibrant Performance. Pipe Outlet Diameter: 1.89in (48 mm). Height: 4.72in (120 mm). Outlet: 3.07in x 2.52in (78 mm x 64 mm) (approx). In many cases, the most time consuming part of fabricating a turbo manifold is building the merge collector. Vibrant Performance makes manifold fabrication easier and more cost effective with our large selection of Turbo Manifold Merge Collectors.