Exhaust Headers for Acura Integra (1994-2001) 1.8L EngineHigh Flow T304 Exhaust Headers for 1994 2001 Acura Integra (B18B1 DC4) What it Does: Replaces the restrictive factory cast iron manifold with a tuned 4 2 1 stainless steel system to optimize exhaust scavenging and reduce backpressure on B series non VTEC engines. The Stock Integra Flow Restriction The factory exhaust manifold on the B18B1 equipped Integra LS, RS, and GS trims is a heavy cast iron component designed primarily for noise suppression and