Ballade Sports T4 Turbo Merge CollectorBallade Sports T4 Turbo Merge Collector is a must have for any DIY turbo manifold builder. This is the same collector used for our S2000 turbo manifold. Made from cast 321stainless steel designed to work with 1. 5" schedule 10 or 40 nominal pipe. This collector will save you hours of labor, no more wasting material trying to figure out angles on the band saw. Reduce welding and porting time drastically! Features include smooth internals, radius flow