BLOX Racing is proud to offer its Performance DIY product line for today’s growing Do-It-Yourself fabricator. Whether you are just learning to fabricate and weld or you are a seasoned veteran, BLOX Racing can supply your needs. The BLOX Racing merge collectors are a perfect choice of fabricators when building a custom exhaust header or turbo exhaust manifold. Small and large sizes are available in both welded and non-welded configurations. Small and large sizes available. Box Merge Collector Specs Length: 3" (small) / 5" (large) ID:  48mm (small) / 49mm (large) Outlet: (small) 55mm x 59mm (approx) / (large) 59mm x 67mm (approx) Schedule 10 Fits T3, T3/T4 and T4 flanges

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