3" diameter tube, offroad adaptors with O2 bungs, only, designed to fit with Bassani stainless steel Longtubes Part# S5011R or stock manifolds, does not include catalytic converters-Off-Road use only. X Crossover NOT INCLUDED. Only works with Bassani X pipe and exhaust kit Part# 5011R5. Legal in California only for racing vehicles which may never be used upon a highway.
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