STAINLESS STEEL Exhaust Manifold Header for 1994-01 Acura Integra B16 B18 B20 Tri-Y STAINLESS STEEL 1994-2001 Acura Integra B16 B18 B20 Tri-Y Exhaust Manifold Header 4-2-1 Tri-Y cat deleted design. 2.5" collector flange. Gains instant 15-20 horsepower. O2 sensor insertion ready.