SRS EXHAUST SYSTEMS 4-2-1 HEADER 2.5" STAINLESS STEEL (HONDA B16A1-ENGINES)Manifold Civic CRX 4 2 1 stainless steel 2. 5 inch Do you really want the power of your Civic CRX Vtec to come into its own? Then choose this SRS manifold 4 2 1 stainless steel with 2. 5 inch connection. 4 2 1 = Maximum power gain at low rpm Including connection 2 lambda sensors 2. 5" cat replacement test pipe needed for assembly Pay attention! This manifold does not fit on your original catalyst due to the thicker diameter. Combine this SRS manifold